Finding the Third Proportional to 56,142 and 86,715

Step by Step Solution

1. Step 1: Write the proportion equation
   56,142 : 86,715 = 86,715 : x
2. Step 2: Convert to fraction form
   56,142/86,715 = 86,715/x
3. Step 3: Cross multiply
   56,142x = 86,715 × 86,715
4. Step 4: Simplify right side
   56,142x = 7,519,491,225
5. Step 5: Solve for x
   x = 7,519,491,225/56,142
6. Step 6: Final answer
   x = 133,937.00