Finding the Fourth Proportional to 1,401.92, 2,108.64 and 1,229.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.92 : 2,108.64 = 1,229.12 : x
2. Step 2: Convert to fraction form
   1,401.92/2,108.64 = 1,229.12/x
3. Step 3: Cross multiply
   1,401.92x = 2,108.64 × 1,229.12
4. Step 4: Simplify right side
   1,401.92x = 2,591,771.60
5. Step 5: Solve for x
   x = 2,591,771.60/1,401.92
6. Step 6: Final answer
   x = 1,848.73