Finding the Fourth Proportional to 617,139.30, 925,527.51 and 262,150.50

Step by Step Solution

1. Step 1: Write the proportion equation
   617,139.30 : 925,527.51 = 262,150.50 : x
2. Step 2: Convert to fraction form
   617,139.30/925,527.51 = 262,150.50/x
3. Step 3: Cross multiply
   617,139.30x = 925,527.51 × 262,150.50
4. Step 4: Simplify right side
   617,139.30x = 242,627,499,510.26
5. Step 5: Solve for x
   x = 242,627,499,510.26/617,139.30
6. Step 6: Final answer
   x = 393,148.68