Finding the Third Proportional to 39,990 and 59,706

Step by Step Solution

1. Step 1: Write the proportion equation
   39,990 : 59,706 = 59,706 : x
2. Step 2: Convert to fraction form
   39,990/59,706 = 59,706/x
3. Step 3: Cross multiply
   39,990x = 59,706 × 59,706
4. Step 4: Simplify right side
   39,990x = 3,564,806,436
5. Step 5: Solve for x
   x = 3,564,806,436/39,990
6. Step 6: Final answer
   x = 89,142.45