Finding the Third Proportional to 31,228.88 and 66,919.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,228.88 : 66,919.50 = 66,919.50 : x
2. Step 2: Convert to fraction form
   31,228.88/66,919.50 = 66,919.50/x
3. Step 3: Cross multiply
   31,228.88x = 66,919.50 × 66,919.50
4. Step 4: Simplify right side
   31,228.88x = 4,478,219,480.25
5. Step 5: Solve for x
   x = 4,478,219,480.25/31,228.88
6. Step 6: Final answer
   x = 143,399.96