Finding the Third Proportional to 1,000,458 and 2,158,380

Step by Step Solution

1. Step 1: Write the proportion equation
   1,000,458 : 2,158,380 = 2,158,380 : x
2. Step 2: Convert to fraction form
   1,000,458/2,158,380 = 2,158,380/x
3. Step 3: Cross multiply
   1,000,458x = 2,158,380 × 2,158,380
4. Step 4: Simplify right side
   1,000,458x = 4,658,604,224,400
5. Step 5: Solve for x
   x = 4,658,604,224,400/1,000,458
6. Step 6: Final answer
   x = 4,656,471.56