Finding the Third Proportional to 138,436.50 and 216,882

Step by Step Solution

1. Step 1: Write the proportion equation
   138,436.50 : 216,882 = 216,882 : x
2. Step 2: Convert to fraction form
   138,436.50/216,882 = 216,882/x
3. Step 3: Cross multiply
   138,436.50x = 216,882 × 216,882
4. Step 4: Simplify right side
   138,436.50x = 47,037,801,924
5. Step 5: Solve for x
   x = 47,037,801,924/138,436.50
6. Step 6: Final answer
   x = 339,778.90