Finding the Third Proportional to 261,245 and 390,854.50

Step by Step Solution

1. Step 1: Write the proportion equation
   261,245 : 390,854.50 = 390,854.50 : x
2. Step 2: Convert to fraction form
   261,245/390,854.50 = 390,854.50/x
3. Step 3: Cross multiply
   261,245x = 390,854.50 × 390,854.50
4. Step 4: Simplify right side
   261,245x = 152,767,240,170.25
5. Step 5: Solve for x
   x = 152,767,240,170.25/261,245
6. Step 6: Final answer
   x = 584,766.18