Finding the Fourth Proportional to 1,928.72, 2,661.78 and 1,142.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,928.72 : 2,661.78 = 1,142.93 : x
2. Step 2: Convert to fraction form
   1,928.72/2,661.78 = 1,142.93/x
3. Step 3: Cross multiply
   1,928.72x = 2,661.78 × 1,142.93
4. Step 4: Simplify right side
   1,928.72x = 3,042,228.22
5. Step 5: Solve for x
   x = 3,042,228.22/1,928.72
6. Step 6: Final answer
   x = 1,577.33