Finding the Fourth Proportional to 1,867.78, 2,577.36 and 1,081.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,867.78 : 2,577.36 = 1,081.72 : x
2. Step 2: Convert to fraction form
   1,867.78/2,577.36 = 1,081.72/x
3. Step 3: Cross multiply
   1,867.78x = 2,577.36 × 1,081.72
4. Step 4: Simplify right side
   1,867.78x = 2,787,981.86
5. Step 5: Solve for x
   x = 2,787,981.86/1,867.78
6. Step 6: Final answer
   x = 1,492.67