Finding the Third Proportional to 518,141 and 1,221,385

Step by Step Solution

1. Step 1: Write the proportion equation
   518,141 : 1,221,385 = 1,221,385 : x
2. Step 2: Convert to fraction form
   518,141/1,221,385 = 1,221,385/x
3. Step 3: Cross multiply
   518,141x = 1,221,385 × 1,221,385
4. Step 4: Simplify right side
   518,141x = 1,491,781,318,225
5. Step 5: Solve for x
   x = 1,491,781,318,225/518,141
6. Step 6: Final answer
   x = 2,879,103.02