Finding the Fourth Proportional to 128,540.52, 177,389.46 and 71,955.54

Step by Step Solution

1. Step 1: Write the proportion equation
   128,540.52 : 177,389.46 = 71,955.54 : x
2. Step 2: Convert to fraction form
   128,540.52/177,389.46 = 71,955.54/x
3. Step 3: Cross multiply
   128,540.52x = 177,389.46 × 71,955.54
4. Step 4: Simplify right side
   128,540.52x = 12,764,154,384.61
5. Step 5: Solve for x
   x = 12,764,154,384.61/128,540.52
6. Step 6: Final answer
   x = 99,300.63