Finding the Fourth Proportional to 129,109.01, 178,204.25 and 72,538.61

Step by Step Solution

1. Step 1: Write the proportion equation
   129,109.01 : 178,204.25 = 72,538.61 : x
2. Step 2: Convert to fraction form
   129,109.01/178,204.25 = 72,538.61/x
3. Step 3: Cross multiply
   129,109.01x = 178,204.25 × 72,538.61
4. Step 4: Simplify right side
   129,109.01x = 12,926,687,881.42
5. Step 5: Solve for x
   x = 12,926,687,881.42/129,109.01
6. Step 6: Final answer
   x = 100,122.28