Finding the Third Proportional to 252,086.50 and 390,523.50

Step by Step Solution

1. Step 1: Write the proportion equation
   252,086.50 : 390,523.50 = 390,523.50 : x
2. Step 2: Convert to fraction form
   252,086.50/390,523.50 = 390,523.50/x
3. Step 3: Cross multiply
   252,086.50x = 390,523.50 × 390,523.50
4. Step 4: Simplify right side
   252,086.50x = 152,508,604,052.25
5. Step 5: Solve for x
   x = 152,508,604,052.25/252,086.50
6. Step 6: Final answer
   x = 604,985.21