Finding the Third Proportional to 243,134 and 390,650

Step by Step Solution

1. Step 1: Write the proportion equation
   243,134 : 390,650 = 390,650 : x
2. Step 2: Convert to fraction form
   243,134/390,650 = 390,650/x
3. Step 3: Cross multiply
   243,134x = 390,650 × 390,650
4. Step 4: Simplify right side
   243,134x = 152,607,422,500
5. Step 5: Solve for x
   x = 152,607,422,500/243,134
6. Step 6: Final answer
   x = 627,667.96