Finding the Fourth Proportional to 128,301.94, 177,057.33 and 71,712.10

Step by Step Solution

1. Step 1: Write the proportion equation
   128,301.94 : 177,057.33 = 71,712.10 : x
2. Step 2: Convert to fraction form
   128,301.94/177,057.33 = 71,712.10/x
3. Step 3: Cross multiply
   128,301.94x = 177,057.33 × 71,712.10
4. Step 4: Simplify right side
   128,301.94x = 12,697,152,954.69
5. Step 5: Solve for x
   x = 12,697,152,954.69/128,301.94
6. Step 6: Final answer
   x = 98,963.06