Finding the Fourth Proportional to 123,156.38, 169,957.70 and 72,156.91

Step by Step Solution

1. Step 1: Write the proportion equation
   123,156.38 : 169,957.70 = 72,156.91 : x
2. Step 2: Convert to fraction form
   123,156.38/169,957.70 = 72,156.91/x
3. Step 3: Cross multiply
   123,156.38x = 169,957.70 × 72,156.91
4. Step 4: Simplify right side
   123,156.38x = 12,263,622,462.71
5. Step 5: Solve for x
   x = 12,263,622,462.71/123,156.38
6. Step 6: Final answer
   x = 99,577.65