Finding the Third Proportional to 14,415 and 31,290.50

Step by Step Solution

1. Step 1: Write the proportion equation
   14,415 : 31,290.50 = 31,290.50 : x
2. Step 2: Convert to fraction form
   14,415/31,290.50 = 31,290.50/x
3. Step 3: Cross multiply
   14,415x = 31,290.50 × 31,290.50
4. Step 4: Simplify right side
   14,415x = 979,095,390.25
5. Step 5: Solve for x
   x = 979,095,390.25/14,415
6. Step 6: Final answer
   x = 67,921.98