Finding the Third Proportional to 54,139.50 and 83,670.75

Step by Step Solution

1. Step 1: Write the proportion equation
   54,139.50 : 83,670.75 = 83,670.75 : x
2. Step 2: Convert to fraction form
   54,139.50/83,670.75 = 83,670.75/x
3. Step 3: Cross multiply
   54,139.50x = 83,670.75 × 83,670.75
4. Step 4: Simplify right side
   54,139.50x = 7,000,794,405.56
5. Step 5: Solve for x
   x = 7,000,794,405.56/54,139.50
6. Step 6: Final answer
   x = 129,310.29