Finding the Fourth Proportional to 1,878.31, 2,591.99 and 1,039.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,878.31 : 2,591.99 = 1,039.05 : x
2. Step 2: Convert to fraction form
   1,878.31/2,591.99 = 1,039.05/x
3. Step 3: Cross multiply
   1,878.31x = 2,591.99 × 1,039.05
4. Step 4: Simplify right side
   1,878.31x = 2,693,189.05
5. Step 5: Solve for x
   x = 2,693,189.05/1,878.31
6. Step 6: Final answer
   x = 1,433.84