Finding the Fourth Proportional to 1,863.72, 2,790.72 and 1,491.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,863.72 : 2,790.72 = 1,491.80 : x
2. Step 2: Convert to fraction form
   1,863.72/2,790.72 = 1,491.80/x
3. Step 3: Cross multiply
   1,863.72x = 2,790.72 × 1,491.80
4. Step 4: Simplify right side
   1,863.72x = 4,163,182.14
5. Step 5: Solve for x
   x = 4,163,182.14/1,863.72
6. Step 6: Final answer
   x = 2,233.80