Finding the Fourth Proportional to 128,870.92, 177,841.33 and 72,282.30

Step by Step Solution

1. Step 1: Write the proportion equation
   128,870.92 : 177,841.33 = 72,282.30 : x
2. Step 2: Convert to fraction form
   128,870.92/177,841.33 = 72,282.30/x
3. Step 3: Cross multiply
   128,870.92x = 177,841.33 × 72,282.30
4. Step 4: Simplify right side
   128,870.92x = 12,854,780,367.46
5. Step 5: Solve for x
   x = 12,854,780,367.46/128,870.92
6. Step 6: Final answer
   x = 99,749.27