Finding the Third Proportional to 663,280 and 1,421,190

Step by Step Solution

1. Step 1: Write the proportion equation
   663,280 : 1,421,190 = 1,421,190 : x
2. Step 2: Convert to fraction form
   663,280/1,421,190 = 1,421,190/x
3. Step 3: Cross multiply
   663,280x = 1,421,190 × 1,421,190
4. Step 4: Simplify right side
   663,280x = 2,019,781,016,100
5. Step 5: Solve for x
   x = 2,019,781,016,100/663,280
6. Step 6: Final answer
   x = 3,045,140.84