Finding the Third Proportional to 31,164 and 66,699.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,164 : 66,699.50 = 66,699.50 : x
2. Step 2: Convert to fraction form
   31,164/66,699.50 = 66,699.50/x
3. Step 3: Cross multiply
   31,164x = 66,699.50 × 66,699.50
4. Step 4: Simplify right side
   31,164x = 4,448,823,300.25
5. Step 5: Solve for x
   x = 4,448,823,300.25/31,164
6. Step 6: Final answer
   x = 142,755.21