Finding the Third Proportional to 1,866,643 and 3,989,164

Step by Step Solution

1. Step 1: Write the proportion equation
   1,866,643 : 3,989,164 = 3,989,164 : x
2. Step 2: Convert to fraction form
   1,866,643/3,989,164 = 3,989,164/x
3. Step 3: Cross multiply
   1,866,643x = 3,989,164 × 3,989,164
4. Step 4: Simplify right side
   1,866,643x = 15,913,429,418,896
5. Step 5: Solve for x
   x = 15,913,429,418,896/1,866,643
6. Step 6: Final answer
   x = 8,525,159.56