Finding the Fourth Proportional to 129,488.42, 178,711.06 and 72,910.82

Step by Step Solution

1. Step 1: Write the proportion equation
   129,488.42 : 178,711.06 = 72,910.82 : x
2. Step 2: Convert to fraction form
   129,488.42/178,711.06 = 72,910.82/x
3. Step 3: Cross multiply
   129,488.42x = 178,711.06 × 72,910.82
4. Step 4: Simplify right side
   129,488.42x = 13,029,969,927.67
5. Step 5: Solve for x
   x = 13,029,969,927.67/129,488.42
6. Step 6: Final answer
   x = 100,626.53