Finding the Fourth Proportional to 91,789.31, 126,433.23 and 64,885.55

Step by Step Solution

1. Step 1: Write the proportion equation
   91,789.31 : 126,433.23 = 64,885.55 : x
2. Step 2: Convert to fraction form
   91,789.31/126,433.23 = 64,885.55/x
3. Step 3: Cross multiply
   91,789.31x = 126,433.23 × 64,885.55
4. Step 4: Simplify right side
   91,789.31x = 8,203,689,666.83
5. Step 5: Solve for x
   x = 8,203,689,666.83/91,789.31
6. Step 6: Final answer
   x = 89,375.22