Finding the Fourth Proportional to 2,893.50, 3,990.72 and 1,871.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,893.50 : 3,990.72 = 1,871.10 : x
2. Step 2: Convert to fraction form
   2,893.50/3,990.72 = 1,871.10/x
3. Step 3: Cross multiply
   2,893.50x = 3,990.72 × 1,871.10
4. Step 4: Simplify right side
   2,893.50x = 7,467,036.19
5. Step 5: Solve for x
   x = 7,467,036.19/2,893.50
6. Step 6: Final answer
   x = 2,580.62