Finding the Fourth Proportional to 1,433.16, 1,976.40 and 1,223.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,433.16 : 1,976.40 = 1,223.10 : x
2. Step 2: Convert to fraction form
   1,433.16/1,976.40 = 1,223.10/x
3. Step 3: Cross multiply
   1,433.16x = 1,976.40 × 1,223.10
4. Step 4: Simplify right side
   1,433.16x = 2,417,334.84
5. Step 5: Solve for x
   x = 2,417,334.84/1,433.16
6. Step 6: Final answer
   x = 1,686.72