Finding the Fourth Proportional to 2,225.78, 3,071.58 and 1,231.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,225.78 : 3,071.58 = 1,231.10 : x
2. Step 2: Convert to fraction form
   2,225.78/3,071.58 = 1,231.10/x
3. Step 3: Cross multiply
   2,225.78x = 3,071.58 × 1,231.10
4. Step 4: Simplify right side
   2,225.78x = 3,781,422.14
5. Step 5: Solve for x
   x = 3,781,422.14/2,225.78
6. Step 6: Final answer
   x = 1,698.92