Finding the Fourth Proportional to 128,452.34, 177,258.78 and 71,086.30

Step by Step Solution

1. Step 1: Write the proportion equation
   128,452.34 : 177,258.78 = 71,086.30 : x
2. Step 2: Convert to fraction form
   128,452.34/177,258.78 = 71,086.30/x
3. Step 3: Cross multiply
   128,452.34x = 177,258.78 × 71,086.30
4. Step 4: Simplify right side
   128,452.34x = 12,600,670,120.30
5. Step 5: Solve for x
   x = 12,600,670,120.30/128,452.34
6. Step 6: Final answer
   x = 98,096.07