Finding the Third Proportional to 915,786 and 1,989,216

Step by Step Solution

1. Step 1: Write the proportion equation
   915,786 : 1,989,216 = 1,989,216 : x
2. Step 2: Convert to fraction form
   915,786/1,989,216 = 1,989,216/x
3. Step 3: Cross multiply
   915,786x = 1,989,216 × 1,989,216
4. Step 4: Simplify right side
   915,786x = 3,956,980,294,656
5. Step 5: Solve for x
   x = 3,956,980,294,656/915,786
6. Step 6: Final answer
   x = 4,320,856.94