Finding the Fourth Proportional to 1,877.55, 2,817.72 and 1,391.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,877.55 : 2,817.72 = 1,391.91 : x
2. Step 2: Convert to fraction form
   1,877.55/2,817.72 = 1,391.91/x
3. Step 3: Cross multiply
   1,877.55x = 2,817.72 × 1,391.91
4. Step 4: Simplify right side
   1,877.55x = 3,922,012.65
5. Step 5: Solve for x
   x = 3,922,012.65/1,877.55
6. Step 6: Final answer
   x = 2,088.90