Finding the Fourth Proportional to 2,225.28, 3,070.72 and 1,230.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,225.28 : 3,070.72 = 1,230.40 : x
2. Step 2: Convert to fraction form
   2,225.28/3,070.72 = 1,230.40/x
3. Step 3: Cross multiply
   2,225.28x = 3,070.72 × 1,230.40
4. Step 4: Simplify right side
   2,225.28x = 3,778,213.89
5. Step 5: Solve for x
   x = 3,778,213.89/2,225.28
6. Step 6: Final answer
   x = 1,697.86