Finding the Third Proportional to 54,720 and 82,390.50

Step by Step Solution

1. Step 1: Write the proportion equation
   54,720 : 82,390.50 = 82,390.50 : x
2. Step 2: Convert to fraction form
   54,720/82,390.50 = 82,390.50/x
3. Step 3: Cross multiply
   54,720x = 82,390.50 × 82,390.50
4. Step 4: Simplify right side
   54,720x = 6,788,194,490.25
5. Step 5: Solve for x
   x = 6,788,194,490.25/54,720
6. Step 6: Final answer
   x = 124,053.26