Finding the Fourth Proportional to 2,225.40, 3,070.96 and 1,230.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,225.40 : 3,070.96 = 1,230.72 : x
2. Step 2: Convert to fraction form
   2,225.40/3,070.96 = 1,230.72/x
3. Step 3: Cross multiply
   2,225.40x = 3,070.96 × 1,230.72
4. Step 4: Simplify right side
   2,225.40x = 3,779,491.89
5. Step 5: Solve for x
   x = 3,779,491.89/2,225.40
6. Step 6: Final answer
   x = 1,698.34