Finding the Fourth Proportional to 1,275.72, 1,911.18 and 1,077

Step by Step Solution

1. Step 1: Write the proportion equation
   1,275.72 : 1,911.18 = 1,077 : x
2. Step 2: Convert to fraction form
   1,275.72/1,911.18 = 1,077/x
3. Step 3: Cross multiply
   1,275.72x = 1,911.18 × 1,077
4. Step 4: Simplify right side
   1,275.72x = 2,058,340.86
5. Step 5: Solve for x
   x = 2,058,340.86/1,275.72
6. Step 6: Final answer
   x = 1,613.47