Finding the Fourth Proportional to 538,213.57, 743,490.17 and 509,870.05

Step by Step Solution

1. Step 1: Write the proportion equation
   538,213.57 : 743,490.17 = 509,870.05 : x
2. Step 2: Convert to fraction form
   538,213.57/743,490.17 = 509,870.05/x
3. Step 3: Cross multiply
   538,213.57x = 743,490.17 × 509,870.05
4. Step 4: Simplify right side
   538,213.57x = 379,083,370,152.41
5. Step 5: Solve for x
   x = 379,083,370,152.41/538,213.57
6. Step 6: Final answer
   x = 704,336.33