Finding the Third Proportional to 261,247.50 and 390,858

Step by Step Solution

1. Step 1: Write the proportion equation
   261,247.50 : 390,858 = 390,858 : x
2. Step 2: Convert to fraction form
   261,247.50/390,858 = 390,858/x
3. Step 3: Cross multiply
   261,247.50x = 390,858 × 390,858
4. Step 4: Simplify right side
   261,247.50x = 152,769,976,164
5. Step 5: Solve for x
   x = 152,769,976,164/261,247.50
6. Step 6: Final answer
   x = 584,771.05