Finding the Fourth Proportional to 128,517.48, 177,356.52 and 71,928.72

Step by Step Solution

1. Step 1: Write the proportion equation
   128,517.48 : 177,356.52 = 71,928.72 : x
2. Step 2: Convert to fraction form
   128,517.48/177,356.52 = 71,928.72/x
3. Step 3: Cross multiply
   128,517.48x = 177,356.52 × 71,928.72
4. Step 4: Simplify right side
   128,517.48x = 12,757,027,467.25
5. Step 5: Solve for x
   x = 12,757,027,467.25/128,517.48
6. Step 6: Final answer
   x = 99,262.98