Finding the Fourth Proportional to 899,978.42, 1,241,970.90 and 492,073.76

Step by Step Solution

1. Step 1: Write the proportion equation
   899,978.42 : 1,241,970.90 = 492,073.76 : x
2. Step 2: Convert to fraction form
   899,978.42/1,241,970.90 = 492,073.76/x
3. Step 3: Cross multiply
   899,978.42x = 1,241,970.90 × 492,073.76
4. Step 4: Simplify right side
   899,978.42x = 611,141,290,573.58
5. Step 5: Solve for x
   x = 611,141,290,573.58/899,978.42
6. Step 6: Final answer
   x = 679,062.16