Finding the Third Proportional to 57,489 and 123,719.50

Step by Step Solution

1. Step 1: Write the proportion equation
   57,489 : 123,719.50 = 123,719.50 : x
2. Step 2: Convert to fraction form
   57,489/123,719.50 = 123,719.50/x
3. Step 3: Cross multiply
   57,489x = 123,719.50 × 123,719.50
4. Step 4: Simplify right side
   57,489x = 15,306,514,680.25
5. Step 5: Solve for x
   x = 15,306,514,680.25/57,489
6. Step 6: Final answer
   x = 266,251.19