Finding the Third Proportional to 61,399.50 and 91,720.13

Step by Step Solution

1. Step 1: Write the proportion equation
   61,399.50 : 91,720.13 = 91,720.13 : x
2. Step 2: Convert to fraction form
   61,399.50/91,720.13 = 91,720.13/x
3. Step 3: Cross multiply
   61,399.50x = 91,720.13 × 91,720.13
4. Step 4: Simplify right side
   61,399.50x = 8,412,581,330.02
5. Step 5: Solve for x
   x = 8,412,581,330.02/61,399.50
6. Step 6: Final answer
   x = 137,013.84