Finding the Third Proportional to 1,291,399 and 2,815,315

Step by Step Solution

1. Step 1: Write the proportion equation
   1,291,399 : 2,815,315 = 2,815,315 : x
2. Step 2: Convert to fraction form
   1,291,399/2,815,315 = 2,815,315/x
3. Step 3: Cross multiply
   1,291,399x = 2,815,315 × 2,815,315
4. Step 4: Simplify right side
   1,291,399x = 7,925,998,549,225
5. Step 5: Solve for x
   x = 7,925,998,549,225/1,291,399
6. Step 6: Final answer
   x = 6,137,528.80