Finding the Third Proportional to 1,139,472 and 1,691,640

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139,472 : 1,691,640 = 1,691,640 : x
2. Step 2: Convert to fraction form
   1,139,472/1,691,640 = 1,691,640/x
3. Step 3: Cross multiply
   1,139,472x = 1,691,640 × 1,691,640
4. Step 4: Simplify right side
   1,139,472x = 2,861,645,889,600
5. Step 5: Solve for x
   x = 2,861,645,889,600/1,139,472
6. Step 6: Final answer
   x = 2,511,378.86