Finding the Third Proportional to 128,244 and 280,081.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,244 : 280,081.50 = 280,081.50 : x
2. Step 2: Convert to fraction form
   128,244/280,081.50 = 280,081.50/x
3. Step 3: Cross multiply
   128,244x = 280,081.50 × 280,081.50
4. Step 4: Simplify right side
   128,244x = 78,445,646,642.25
5. Step 5: Solve for x
   x = 78,445,646,642.25/128,244
6. Step 6: Final answer
   x = 611,690.58