Finding the Third Proportional to 58,123.50 and 129,399

Step by Step Solution

1. Step 1: Write the proportion equation
   58,123.50 : 129,399 = 129,399 : x
2. Step 2: Convert to fraction form
   58,123.50/129,399 = 129,399/x
3. Step 3: Cross multiply
   58,123.50x = 129,399 × 129,399
4. Step 4: Simplify right side
   58,123.50x = 16,744,101,201
5. Step 5: Solve for x
   x = 16,744,101,201/58,123.50
6. Step 6: Final answer
   x = 288,077.99