Finding the Fourth Proportional to 868,900,111.21, 1,199,123,147.28 and 492,563,992.96

Step by Step Solution

1. Step 1: Write the proportion equation
   868,900,111.21 : 1,199,123,147.28 = 492,563,992.96 : x
2. Step 2: Convert to fraction form
   868,900,111.21/1,199,123,147.28 = 492,563,992.96/x
3. Step 3: Cross multiply
   868,900,111.21x = 1,199,123,147.28 × 492,563,992.96
4. Step 4: Simplify right side
   868,900,111.21x = 590,644,885,474,998,912
5. Step 5: Solve for x
   x = 590,644,885,474,998,912/868,900,111.21
6. Step 6: Final answer
   x = 679,761,548.95