Finding the Fourth Proportional to 123,156.07, 169,957.27 and 72,156.60

Step by Step Solution

1. Step 1: Write the proportion equation
   123,156.07 : 169,957.27 = 72,156.60 : x
2. Step 2: Convert to fraction form
   123,156.07/169,957.27 = 72,156.60/x
3. Step 3: Cross multiply
   123,156.07x = 169,957.27 × 72,156.60
4. Step 4: Simplify right side
   123,156.07x = 12,263,538,748.48
5. Step 5: Solve for x
   x = 12,263,538,748.48/123,156.07
6. Step 6: Final answer
   x = 99,577.22