Finding the Third Proportional to 31,218 and 68,798

Step by Step Solution

1. Step 1: Write the proportion equation
   31,218 : 68,798 = 68,798 : x
2. Step 2: Convert to fraction form
   31,218/68,798 = 68,798/x
3. Step 3: Cross multiply
   31,218x = 68,798 × 68,798
4. Step 4: Simplify right side
   31,218x = 4,733,164,804
5. Step 5: Solve for x
   x = 4,733,164,804/31,218
6. Step 6: Final answer
   x = 151,616.53