Finding the Fourth Proportional to 129,097.56, 178,171.34 and 72,508.94

Step by Step Solution

1. Step 1: Write the proportion equation
   129,097.56 : 178,171.34 = 72,508.94 : x
2. Step 2: Convert to fraction form
   129,097.56/178,171.34 = 72,508.94/x
3. Step 3: Cross multiply
   129,097.56x = 178,171.34 × 72,508.94
4. Step 4: Simplify right side
   129,097.56x = 12,919,015,001.78
5. Step 5: Solve for x
   x = 12,919,015,001.78/129,097.56
6. Step 6: Final answer
   x = 100,071.72