Finding the Fourth Proportional to 123,171.72, 169,977.08 and 72,174.29

Step by Step Solution

1. Step 1: Write the proportion equation
   123,171.72 : 169,977.08 = 72,174.29 : x
2. Step 2: Convert to fraction form
   123,171.72/169,977.08 = 72,174.29/x
3. Step 3: Cross multiply
   123,171.72x = 169,977.08 × 72,174.29
4. Step 4: Simplify right side
   123,171.72x = 12,267,973,854.52
5. Step 5: Solve for x
   x = 12,267,973,854.52/123,171.72
6. Step 6: Final answer
   x = 99,600.57