Finding the Third Proportional to 252,084 and 390,519.75

Step by Step Solution

1. Step 1: Write the proportion equation
   252,084 : 390,519.75 = 390,519.75 : x
2. Step 2: Convert to fraction form
   252,084/390,519.75 = 390,519.75/x
3. Step 3: Cross multiply
   252,084x = 390,519.75 × 390,519.75
4. Step 4: Simplify right side
   252,084x = 152,505,675,140.06
5. Step 5: Solve for x
   x = 152,505,675,140.06/252,084
6. Step 6: Final answer
   x = 604,979.59