Finding the Third Proportional to 61,407.50 and 91,731.75

Step by Step Solution

1. Step 1: Write the proportion equation
   61,407.50 : 91,731.75 = 91,731.75 : x
2. Step 2: Convert to fraction form
   61,407.50/91,731.75 = 91,731.75/x
3. Step 3: Cross multiply
   61,407.50x = 91,731.75 × 91,731.75
4. Step 4: Simplify right side
   61,407.50x = 8,414,713,958.06
5. Step 5: Solve for x
   x = 8,414,713,958.06/61,407.50
6. Step 6: Final answer
   x = 137,030.72