Finding the Third Proportional to 31,011.50 and 66,521.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,011.50 : 66,521.50 = 66,521.50 : x
2. Step 2: Convert to fraction form
   31,011.50/66,521.50 = 66,521.50/x
3. Step 3: Cross multiply
   31,011.50x = 66,521.50 × 66,521.50
4. Step 4: Simplify right side
   31,011.50x = 4,425,109,962.25
5. Step 5: Solve for x
   x = 4,425,109,962.25/31,011.50
6. Step 6: Final answer
   x = 142,692.55