Finding the Third Proportional to 1,145,128 and 1,555,215

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145,128 : 1,555,215 = 1,555,215 : x
2. Step 2: Convert to fraction form
   1,145,128/1,555,215 = 1,555,215/x
3. Step 3: Cross multiply
   1,145,128x = 1,555,215 × 1,555,215
4. Step 4: Simplify right side
   1,145,128x = 2,418,693,696,225
5. Step 5: Solve for x
   x = 2,418,693,696,225/1,145,128
6. Step 6: Final answer
   x = 2,112,160.12