Finding the Fourth Proportional to 123,128.16, 169,849.20 and 72,817.44

Step by Step Solution

1. Step 1: Write the proportion equation
   123,128.16 : 169,849.20 = 72,817.44 : x
2. Step 2: Convert to fraction form
   123,128.16/169,849.20 = 72,817.44/x
3. Step 3: Cross multiply
   123,128.16x = 169,849.20 × 72,817.44
4. Step 4: Simplify right side
   123,128.16x = 12,367,983,930.05
5. Step 5: Solve for x
   x = 12,367,983,930.05/123,128.16
6. Step 6: Final answer
   x = 100,448.05