Finding the Third Proportional to 127,482.25 and 280,128.50

Step by Step Solution

1. Step 1: Write the proportion equation
   127,482.25 : 280,128.50 = 280,128.50 : x
2. Step 2: Convert to fraction form
   127,482.25/280,128.50 = 280,128.50/x
3. Step 3: Cross multiply
   127,482.25x = 280,128.50 × 280,128.50
4. Step 4: Simplify right side
   127,482.25x = 78,471,976,512.25
5. Step 5: Solve for x
   x = 78,471,976,512.25/127,482.25
6. Step 6: Final answer
   x = 615,552.18