Finding the Fourth Proportional to 1,138.72, 1,572.56 and 1,074.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,138.72 : 1,572.56 = 1,074.08 : x
2. Step 2: Convert to fraction form
   1,138.72/1,572.56 = 1,074.08/x
3. Step 3: Cross multiply
   1,138.72x = 1,572.56 × 1,074.08
4. Step 4: Simplify right side
   1,138.72x = 1,689,055.24
5. Step 5: Solve for x
   x = 1,689,055.24/1,138.72
6. Step 6: Final answer
   x = 1,483.29