Finding the Fourth Proportional to 42,686,978.90, 64,020,885.15 and 19,635,774.74

Step by Step Solution

1. Step 1: Write the proportion equation
   42,686,978.90 : 64,020,885.15 = 19,635,774.74 : x
2. Step 2: Convert to fraction form
   42,686,978.90/64,020,885.15 = 19,635,774.74/x
3. Step 3: Cross multiply
   42,686,978.90x = 64,020,885.15 × 19,635,774.74
4. Step 4: Simplify right side
   42,686,978.90x = 1,257,099,679,460,811
5. Step 5: Solve for x
   x = 1,257,099,679,460,811/42,686,978.90
6. Step 6: Final answer
   x = 29,449,253.89