Finding the Third Proportional to 309,255 and 435,490.50

Step by Step Solution

1. Step 1: Write the proportion equation
   309,255 : 435,490.50 = 435,490.50 : x
2. Step 2: Convert to fraction form
   309,255/435,490.50 = 435,490.50/x
3. Step 3: Cross multiply
   309,255x = 435,490.50 × 435,490.50
4. Step 4: Simplify right side
   309,255x = 189,651,975,590.25
5. Step 5: Solve for x
   x = 189,651,975,590.25/309,255
6. Step 6: Final answer
   x = 613,254.36