Finding the Fourth Proportional to 98,128.80, 147,105.72 and 81,624.24

Step by Step Solution

1. Step 1: Write the proportion equation
   98,128.80 : 147,105.72 = 81,624.24 : x
2. Step 2: Convert to fraction form
   98,128.80/147,105.72 = 81,624.24/x
3. Step 3: Cross multiply
   98,128.80x = 147,105.72 × 81,624.24
4. Step 4: Simplify right side
   98,128.80x = 12,007,392,594.65
5. Step 5: Solve for x
   x = 12,007,392,594.65/98,128.80
6. Step 6: Final answer
   x = 122,363.59