Finding the Fourth Proportional to 128,003.88, 176,638.89 and 71,404.32

Step by Step Solution

1. Step 1: Write the proportion equation
   128,003.88 : 176,638.89 = 71,404.32 : x
2. Step 2: Convert to fraction form
   128,003.88/176,638.89 = 71,404.32/x
3. Step 3: Cross multiply
   128,003.88x = 176,638.89 × 71,404.32
4. Step 4: Simplify right side
   128,003.88x = 12,612,779,826.00
5. Step 5: Solve for x
   x = 12,612,779,826.00/128,003.88
6. Step 6: Final answer
   x = 98,534.36