Finding the Fourth Proportional to 91,571.31, 137,567.49 and 64,615.67

Step by Step Solution

1. Step 1: Write the proportion equation
   91,571.31 : 137,567.49 = 64,615.67 : x
2. Step 2: Convert to fraction form
   91,571.31/137,567.49 = 64,615.67/x
3. Step 3: Cross multiply
   91,571.31x = 137,567.49 × 64,615.67
4. Step 4: Simplify right side
   91,571.31x = 8,889,016,077.85
5. Step 5: Solve for x
   x = 8,889,016,077.85/91,571.31
6. Step 6: Final answer
   x = 97,072.06