Finding the Fourth Proportional to 171,499.76, 257,337.46 and 81,644.13

Step by Step Solution

1. Step 1: Write the proportion equation
   171,499.76 : 257,337.46 = 81,644.13 : x
2. Step 2: Convert to fraction form
   171,499.76/257,337.46 = 81,644.13/x
3. Step 3: Cross multiply
   171,499.76x = 257,337.46 × 81,644.13
4. Step 4: Simplify right side
   171,499.76x = 21,010,091,957.16
5. Step 5: Solve for x
   x = 21,010,091,957.16/171,499.76
6. Step 6: Final answer
   x = 122,508.00