Finding the Fourth Proportional to 123,156.51, 169,957.87 and 72,157.04

Step by Step Solution

1. Step 1: Write the proportion equation
   123,156.51 : 169,957.87 = 72,157.04 : x
2. Step 2: Convert to fraction form
   123,156.51/169,957.87 = 72,157.04/x
3. Step 3: Cross multiply
   123,156.51x = 169,957.87 × 72,157.04
4. Step 4: Simplify right side
   123,156.51x = 12,263,656,823.90
5. Step 5: Solve for x
   x = 12,263,656,823.90/123,156.51
6. Step 6: Final answer
   x = 99,577.82