Finding the Fourth Proportional to 2,225.79, 3,071.78 and 1,231.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,225.79 : 3,071.78 = 1,231.38 : x
2. Step 2: Convert to fraction form
   2,225.79/3,071.78 = 1,231.38/x
3. Step 3: Cross multiply
   2,225.79x = 3,071.78 × 1,231.38
4. Step 4: Simplify right side
   2,225.79x = 3,782,522.30
5. Step 5: Solve for x
   x = 3,782,522.30/2,225.79
6. Step 6: Final answer
   x = 1,699.41