Finding the Fourth Proportional to 2,225.72, 3,071.32 and 1,231.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,225.72 : 3,071.32 = 1,231.01 : x
2. Step 2: Convert to fraction form
   2,225.72/3,071.32 = 1,231.01/x
3. Step 3: Cross multiply
   2,225.72x = 3,071.32 × 1,231.01
4. Step 4: Simplify right side
   2,225.72x = 3,780,807.20
5. Step 5: Solve for x
   x = 3,780,807.20/2,225.72
6. Step 6: Final answer
   x = 1,698.69