Finding the Third Proportional to 915,156 and 1,391,390

Step by Step Solution

1. Step 1: Write the proportion equation
   915,156 : 1,391,390 = 1,391,390 : x
2. Step 2: Convert to fraction form
   915,156/1,391,390 = 1,391,390/x
3. Step 3: Cross multiply
   915,156x = 1,391,390 × 1,391,390
4. Step 4: Simplify right side
   915,156x = 1,935,966,132,100
5. Step 5: Solve for x
   x = 1,935,966,132,100/915,156
6. Step 6: Final answer
   x = 2,115,449.31