Finding the Fourth Proportional to 2,903.40, 4,005.72 and 1,856.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,903.40 : 4,005.72 = 1,856.10 : x
2. Step 2: Convert to fraction form
   2,903.40/4,005.72 = 1,856.10/x
3. Step 3: Cross multiply
   2,903.40x = 4,005.72 × 1,856.10
4. Step 4: Simplify right side
   2,903.40x = 7,435,016.89
5. Step 5: Solve for x
   x = 7,435,016.89/2,903.40
6. Step 6: Final answer
   x = 2,560.80