Finding the Third Proportional to 31,312 and 69,620

Step by Step Solution

1. Step 1: Write the proportion equation
   31,312 : 69,620 = 69,620 : x
2. Step 2: Convert to fraction form
   31,312/69,620 = 69,620/x
3. Step 3: Cross multiply
   31,312x = 69,620 × 69,620
4. Step 4: Simplify right side
   31,312x = 4,846,944,400
5. Step 5: Solve for x
   x = 4,846,944,400/31,312
6. Step 6: Final answer
   x = 154,795.11