Finding the Third Proportional to 40,290 and 87,060

Step by Step Solution

1. Step 1: Write the proportion equation
   40,290 : 87,060 = 87,060 : x
2. Step 2: Convert to fraction form
   40,290/87,060 = 87,060/x
3. Step 3: Cross multiply
   40,290x = 87,060 × 87,060
4. Step 4: Simplify right side
   40,290x = 7,579,443,600
5. Step 5: Solve for x
   x = 7,579,443,600/40,290
6. Step 6: Final answer
   x = 188,122.20