Finding the Third Proportional to 128,748 and 260,995.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,748 : 260,995.50 = 260,995.50 : x
2. Step 2: Convert to fraction form
   128,748/260,995.50 = 260,995.50/x
3. Step 3: Cross multiply
   128,748x = 260,995.50 × 260,995.50
4. Step 4: Simplify right side
   128,748x = 68,118,651,020.25
5. Step 5: Solve for x
   x = 68,118,651,020.25/128,748
6. Step 6: Final answer
   x = 529,085.12