Finding the Third Proportional to 31,272 and 66,643.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,272 : 66,643.50 = 66,643.50 : x
2. Step 2: Convert to fraction form
   31,272/66,643.50 = 66,643.50/x
3. Step 3: Cross multiply
   31,272x = 66,643.50 × 66,643.50
4. Step 4: Simplify right side
   31,272x = 4,441,356,092.25
5. Step 5: Solve for x
   x = 4,441,356,092.25/31,272
6. Step 6: Final answer
   x = 142,023.41