Finding the Third Proportional to 138,892 and 287,630

Step by Step Solution

1. Step 1: Write the proportion equation
   138,892 : 287,630 = 287,630 : x
2. Step 2: Convert to fraction form
   138,892/287,630 = 287,630/x
3. Step 3: Cross multiply
   138,892x = 287,630 × 287,630
4. Step 4: Simplify right side
   138,892x = 82,731,016,900
5. Step 5: Solve for x
   x = 82,731,016,900/138,892
6. Step 6: Final answer
   x = 595,649.98