Finding the Fourth Proportional to 2,256.84, 3,113.82 and 1,312.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,256.84 : 3,113.82 = 1,312.20 : x
2. Step 2: Convert to fraction form
   2,256.84/3,113.82 = 1,312.20/x
3. Step 3: Cross multiply
   2,256.84x = 3,113.82 × 1,312.20
4. Step 4: Simplify right side
   2,256.84x = 4,085,954.60
5. Step 5: Solve for x
   x = 4,085,954.60/2,256.84
6. Step 6: Final answer
   x = 1,810.48