Finding the Third Proportional to 153,909 and 245,868.75

Step by Step Solution

1. Step 1: Write the proportion equation
   153,909 : 245,868.75 = 245,868.75 : x
2. Step 2: Convert to fraction form
   153,909/245,868.75 = 245,868.75/x
3. Step 3: Cross multiply
   153,909x = 245,868.75 × 245,868.75
4. Step 4: Simplify right side
   153,909x = 60,451,442,226.56
5. Step 5: Solve for x
   x = 60,451,442,226.56/153,909
6. Step 6: Final answer
   x = 392,773.93