Finding the Fourth Proportional to 753,409.98, 1,039,978.71 and 498,843.18

Step by Step Solution

1. Step 1: Write the proportion equation
   753,409.98 : 1,039,978.71 = 498,843.18 : x
2. Step 2: Convert to fraction form
   753,409.98/1,039,978.71 = 498,843.18/x
3. Step 3: Cross multiply
   753,409.98x = 1,039,978.71 × 498,843.18
4. Step 4: Simplify right side
   753,409.98x = 518,786,286,828.70
5. Step 5: Solve for x
   x = 518,786,286,828.70/753,409.98
6. Step 6: Final answer
   x = 688,584.30