Finding the Fourth Proportional to 128,818.04, 177,751.98 and 71,456.72

Step by Step Solution

1. Step 1: Write the proportion equation
   128,818.04 : 177,751.98 = 71,456.72 : x
2. Step 2: Convert to fraction form
   128,818.04/177,751.98 = 71,456.72/x
3. Step 3: Cross multiply
   128,818.04x = 177,751.98 × 71,456.72
4. Step 4: Simplify right side
   128,818.04x = 12,701,573,464.31
5. Step 5: Solve for x
   x = 12,701,573,464.31/128,818.04
6. Step 6: Final answer
   x = 98,600.89