Finding the Third Proportional to 56,728.88 and 123,438.32

Step by Step Solution

1. Step 1: Write the proportion equation
   56,728.88 : 123,438.32 = 123,438.32 : x
2. Step 2: Convert to fraction form
   56,728.88/123,438.32 = 123,438.32/x
3. Step 3: Cross multiply
   56,728.88x = 123,438.32 × 123,438.32
4. Step 4: Simplify right side
   56,728.88x = 15,237,019,641.08
5. Step 5: Solve for x
   x = 15,237,019,641.08/56,728.88
6. Step 6: Final answer
   x = 268,593.68