Finding the Third Proportional to 621,688 and 1,359,980

Step by Step Solution

1. Step 1: Write the proportion equation
   621,688 : 1,359,980 = 1,359,980 : x
2. Step 2: Convert to fraction form
   621,688/1,359,980 = 1,359,980/x
3. Step 3: Cross multiply
   621,688x = 1,359,980 × 1,359,980
4. Step 4: Simplify right side
   621,688x = 1,849,545,600,400
5. Step 5: Solve for x
   x = 1,849,545,600,400/621,688
6. Step 6: Final answer
   x = 2,975,038.28