Finding the Fourth Proportional to 1,421.28, 1,955.20 and 1,158.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.28 : 1,955.20 = 1,158.72 : x
2. Step 2: Convert to fraction form
   1,421.28/1,955.20 = 1,158.72/x
3. Step 3: Cross multiply
   1,421.28x = 1,955.20 × 1,158.72
4. Step 4: Simplify right side
   1,421.28x = 2,265,529.34
5. Step 5: Solve for x
   x = 2,265,529.34/1,421.28
6. Step 6: Final answer
   x = 1,594.01