Finding the Third Proportional to 38,707.31 and 54,508.78

Step by Step Solution

1. Step 1: Write the proportion equation
   38,707.31 : 54,508.78 = 54,508.78 : x
2. Step 2: Convert to fraction form
   38,707.31/54,508.78 = 54,508.78/x
3. Step 3: Cross multiply
   38,707.31x = 54,508.78 × 54,508.78
4. Step 4: Simplify right side
   38,707.31x = 2,971,207,233.36
5. Step 5: Solve for x
   x = 2,971,207,233.36/38,707.31
6. Step 6: Final answer
   x = 76,760.88