Finding the Fourth Proportional to 2,888.61, 3,986.91 and 1,826.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,888.61 : 3,986.91 = 1,826.31 : x
2. Step 2: Convert to fraction form
   2,888.61/3,986.91 = 1,826.31/x
3. Step 3: Cross multiply
   2,888.61x = 3,986.91 × 1,826.31
4. Step 4: Simplify right side
   2,888.61x = 7,281,333.60
5. Step 5: Solve for x
   x = 7,281,333.60/2,888.61
6. Step 6: Final answer
   x = 2,520.70