Finding the Fourth Proportional to 123,358.47, 170,236.10 and 72,372.09

Step by Step Solution

1. Step 1: Write the proportion equation
   123,358.47 : 170,236.10 = 72,372.09 : x
2. Step 2: Convert to fraction form
   123,358.47/170,236.10 = 72,372.09/x
3. Step 3: Cross multiply
   123,358.47x = 170,236.10 × 72,372.09
4. Step 4: Simplify right side
   123,358.47x = 12,320,341,988.59
5. Step 5: Solve for x
   x = 12,320,341,988.59/123,358.47
6. Step 6: Final answer
   x = 99,874.31