Finding the Third Proportional to 51,061.50 and 71,421.75

Step by Step Solution

1. Step 1: Write the proportion equation
   51,061.50 : 71,421.75 = 71,421.75 : x
2. Step 2: Convert to fraction form
   51,061.50/71,421.75 = 71,421.75/x
3. Step 3: Cross multiply
   51,061.50x = 71,421.75 × 71,421.75
4. Step 4: Simplify right side
   51,061.50x = 5,101,066,373.06
5. Step 5: Solve for x
   x = 5,101,066,373.06/51,061.50
6. Step 6: Final answer
   x = 99,900.44