Finding the Third Proportional to 56,480 and 123,200

Step by Step Solution

1. Step 1: Write the proportion equation
   56,480 : 123,200 = 123,200 : x
2. Step 2: Convert to fraction form
   56,480/123,200 = 123,200/x
3. Step 3: Cross multiply
   56,480x = 123,200 × 123,200
4. Step 4: Simplify right side
   56,480x = 15,178,240,000
5. Step 5: Solve for x
   x = 15,178,240,000/56,480
6. Step 6: Final answer
   x = 268,736.54