Finding the Third Proportional to 31,407.75 and 66,308.63

Step by Step Solution

1. Step 1: Write the proportion equation
   31,407.75 : 66,308.63 = 66,308.63 : x
2. Step 2: Convert to fraction form
   31,407.75/66,308.63 = 66,308.63/x
3. Step 3: Cross multiply
   31,407.75x = 66,308.63 × 66,308.63
4. Step 4: Simplify right side
   31,407.75x = 4,396,833,749.39
5. Step 5: Solve for x
   x = 4,396,833,749.39/31,407.75
6. Step 6: Final answer
   x = 139,992.00