Finding the Fourth Proportional to 128,597.10, 177,459.98 and 71,234.12

Step by Step Solution

1. Step 1: Write the proportion equation
   128,597.10 : 177,459.98 = 71,234.12 : x
2. Step 2: Convert to fraction form
   128,597.10/177,459.98 = 71,234.12/x
3. Step 3: Cross multiply
   128,597.10x = 177,459.98 × 71,234.12
4. Step 4: Simplify right side
   128,597.10x = 12,641,205,510.52
5. Step 5: Solve for x
   x = 12,641,205,510.52/128,597.10
6. Step 6: Final answer
   x = 98,300.86