Finding the Fourth Proportional to 128,086.56, 176,766.30 and 74,388.42

Step by Step Solution

1. Step 1: Write the proportion equation
   128,086.56 : 176,766.30 = 74,388.42 : x
2. Step 2: Convert to fraction form
   128,086.56/176,766.30 = 74,388.42/x
3. Step 3: Cross multiply
   128,086.56x = 176,766.30 × 74,388.42
4. Step 4: Simplify right side
   128,086.56x = 13,149,365,766.25
5. Step 5: Solve for x
   x = 13,149,365,766.25/128,086.56
6. Step 6: Final answer
   x = 102,660.00