Finding the Fourth Proportional to 1,878.31, 2,591.98 and 1,081.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,878.31 : 2,591.98 = 1,081.60 : x
2. Step 2: Convert to fraction form
   1,878.31/2,591.98 = 1,081.60/x
3. Step 3: Cross multiply
   1,878.31x = 2,591.98 × 1,081.60
4. Step 4: Simplify right side
   1,878.31x = 2,803,485.57
5. Step 5: Solve for x
   x = 2,803,485.57/1,878.31
6. Step 6: Final answer
   x = 1,492.56