Finding the Third Proportional to 416,019 and 639,580.50

Step by Step Solution

1. Step 1: Write the proportion equation
   416,019 : 639,580.50 = 639,580.50 : x
2. Step 2: Convert to fraction form
   416,019/639,580.50 = 639,580.50/x
3. Step 3: Cross multiply
   416,019x = 639,580.50 × 639,580.50
4. Step 4: Simplify right side
   416,019x = 409,063,215,980.25
5. Step 5: Solve for x
   x = 409,063,215,980.25/416,019
6. Step 6: Final answer
   x = 983,280.13