Finding the Fourth Proportional to 1,572.54, 2,359.20 and 1,111.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,572.54 : 2,359.20 = 1,111.23 : x
2. Step 2: Convert to fraction form
   1,572.54/2,359.20 = 1,111.23/x
3. Step 3: Cross multiply
   1,572.54x = 2,359.20 × 1,111.23
4. Step 4: Simplify right side
   1,572.54x = 2,621,613.82
5. Step 5: Solve for x
   x = 2,621,613.82/1,572.54
6. Step 6: Final answer
   x = 1,667.12