Finding the Fourth Proportional to 128,443.50, 177,248 and 71,079.36

Step by Step Solution

1. Step 1: Write the proportion equation
   128,443.50 : 177,248 = 71,079.36 : x
2. Step 2: Convert to fraction form
   128,443.50/177,248 = 71,079.36/x
3. Step 3: Cross multiply
   128,443.50x = 177,248 × 71,079.36
4. Step 4: Simplify right side
   128,443.50x = 12,598,674,401.28
5. Step 5: Solve for x
   x = 12,598,674,401.28/128,443.50
6. Step 6: Final answer
   x = 98,087.29