Finding the Third Proportional to 988,455 and 2,158,188

Step by Step Solution

1. Step 1: Write the proportion equation
   988,455 : 2,158,188 = 2,158,188 : x
2. Step 2: Convert to fraction form
   988,455/2,158,188 = 2,158,188/x
3. Step 3: Cross multiply
   988,455x = 2,158,188 × 2,158,188
4. Step 4: Simplify right side
   988,455x = 4,657,775,443,344
5. Step 5: Solve for x
   x = 4,657,775,443,344/988,455
6. Step 6: Final answer
   x = 4,712,177.53