Finding the Third Proportional to 869,778 and 1,224,840

Step by Step Solution

1. Step 1: Write the proportion equation
   869,778 : 1,224,840 = 1,224,840 : x
2. Step 2: Convert to fraction form
   869,778/1,224,840 = 1,224,840/x
3. Step 3: Cross multiply
   869,778x = 1,224,840 × 1,224,840
4. Step 4: Simplify right side
   869,778x = 1,500,233,025,600
5. Step 5: Solve for x
   x = 1,500,233,025,600/869,778
6. Step 6: Final answer
   x = 1,724,845.91