Finding the Fourth Proportional to 900,404.38, 1,242,531.61 and 492,497.39

Step by Step Solution

1. Step 1: Write the proportion equation
   900,404.38 : 1,242,531.61 = 492,497.39 : x
2. Step 2: Convert to fraction form
   900,404.38/1,242,531.61 = 492,497.39/x
3. Step 3: Cross multiply
   900,404.38x = 1,242,531.61 × 492,497.39
4. Step 4: Simplify right side
   900,404.38x = 611,943,573,990.59
5. Step 5: Solve for x
   x = 611,943,573,990.59/900,404.38
6. Step 6: Final answer
   x = 679,631.94