Finding the Third Proportional to 31,317 and 69,385.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,317 : 69,385.50 = 69,385.50 : x
2. Step 2: Convert to fraction form
   31,317/69,385.50 = 69,385.50/x
3. Step 3: Cross multiply
   31,317x = 69,385.50 × 69,385.50
4. Step 4: Simplify right side
   31,317x = 4,814,347,610.25
5. Step 5: Solve for x
   x = 4,814,347,610.25/31,317
6. Step 6: Final answer
   x = 153,729.53