Finding the Fourth Proportional to 129,315.63, 178,455.59 and 72,727

Step by Step Solution

1. Step 1: Write the proportion equation
   129,315.63 : 178,455.59 = 72,727 : x
2. Step 2: Convert to fraction form
   129,315.63/178,455.59 = 72,727/x
3. Step 3: Cross multiply
   129,315.63x = 178,455.59 × 72,727
4. Step 4: Simplify right side
   129,315.63x = 12,978,539,693.93
5. Step 5: Solve for x
   x = 12,978,539,693.93/129,315.63
6. Step 6: Final answer
   x = 100,363.27