Finding the Fourth Proportional to 123,978.52, 185,961.12 and 72,715.72

Step by Step Solution

1. Step 1: Write the proportion equation
   123,978.52 : 185,961.12 = 72,715.72 : x
2. Step 2: Convert to fraction form
   123,978.52/185,961.12 = 72,715.72/x
3. Step 3: Cross multiply
   123,978.52x = 185,961.12 × 72,715.72
4. Step 4: Simplify right side
   123,978.52x = 13,522,296,732.81
5. Step 5: Solve for x
   x = 13,522,296,732.81/123,978.52
6. Step 6: Final answer
   x = 109,069.67