Finding the Fourth Proportional to 1,423.96, 1,965.18 and 1,131.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,423.96 : 1,965.18 = 1,131.64 : x
2. Step 2: Convert to fraction form
   1,423.96/1,965.18 = 1,131.64/x
3. Step 3: Cross multiply
   1,423.96x = 1,965.18 × 1,131.64
4. Step 4: Simplify right side
   1,423.96x = 2,223,876.30
5. Step 5: Solve for x
   x = 2,223,876.30/1,423.96
6. Step 6: Final answer
   x = 1,561.75