Finding the Fourth Proportional to 129,098.40, 178,145.82 and 72,498.84

Step by Step Solution

1. Step 1: Write the proportion equation
   129,098.40 : 178,145.82 = 72,498.84 : x
2. Step 2: Convert to fraction form
   129,098.40/178,145.82 = 72,498.84/x
3. Step 3: Cross multiply
   129,098.40x = 178,145.82 × 72,498.84
4. Step 4: Simplify right side
   129,098.40x = 12,915,365,300.85
5. Step 5: Solve for x
   x = 12,915,365,300.85/129,098.40
6. Step 6: Final answer
   x = 100,042.80