Finding the Third Proportional to 989,760 and 2,156,160

Step by Step Solution

1. Step 1: Write the proportion equation
   989,760 : 2,156,160 = 2,156,160 : x
2. Step 2: Convert to fraction form
   989,760/2,156,160 = 2,156,160/x
3. Step 3: Cross multiply
   989,760x = 2,156,160 × 2,156,160
4. Step 4: Simplify right side
   989,760x = 4,649,025,945,600
5. Step 5: Solve for x
   x = 4,649,025,945,600/989,760
6. Step 6: Final answer
   x = 4,697,124.50