Finding the Third Proportional to 915,157 and 1,391,393

Step by Step Solution

1. Step 1: Write the proportion equation
   915,157 : 1,391,393 = 1,391,393 : x
2. Step 2: Convert to fraction form
   915,157/1,391,393 = 1,391,393/x
3. Step 3: Cross multiply
   915,157x = 1,391,393 × 1,391,393
4. Step 4: Simplify right side
   915,157x = 1,935,974,480,449
5. Step 5: Solve for x
   x = 1,935,974,480,449/915,157
6. Step 6: Final answer
   x = 2,115,456.12