Finding the Third Proportional to 38,639.53 and 81,430.31

Step by Step Solution

1. Step 1: Write the proportion equation
   38,639.53 : 81,430.31 = 81,430.31 : x
2. Step 2: Convert to fraction form
   38,639.53/81,430.31 = 81,430.31/x
3. Step 3: Cross multiply
   38,639.53x = 81,430.31 × 81,430.31
4. Step 4: Simplify right side
   38,639.53x = 6,630,895,793.85
5. Step 5: Solve for x
   x = 6,630,895,793.85/38,639.53
6. Step 6: Final answer
   x = 171,609.12