Finding the Fourth Proportional to 1,878.89, 2,590.16 and 1,317.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,878.89 : 2,590.16 = 1,317.62 : x
2. Step 2: Convert to fraction form
   1,878.89/2,590.16 = 1,317.62/x
3. Step 3: Cross multiply
   1,878.89x = 2,590.16 × 1,317.62
4. Step 4: Simplify right side
   1,878.89x = 3,412,836.57
5. Step 5: Solve for x
   x = 3,412,836.57/1,878.89
6. Step 6: Final answer
   x = 1,816.41