Finding the Fourth Proportional to 577,443.60, 865,128.60 and 494,499.60

Step by Step Solution

1. Step 1: Write the proportion equation
   577,443.60 : 865,128.60 = 494,499.60 : x
2. Step 2: Convert to fraction form
   577,443.60/865,128.60 = 494,499.60/x
3. Step 3: Cross multiply
   577,443.60x = 865,128.60 × 494,499.60
4. Step 4: Simplify right side
   577,443.60x = 427,805,746,648.56
5. Step 5: Solve for x
   x = 427,805,746,648.56/577,443.60
6. Step 6: Final answer
   x = 740,861.53