Finding the Fourth Proportional to 2,208.81, 3,047.89 and 1,312.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,208.81 : 3,047.89 = 1,312.23 : x
2. Step 2: Convert to fraction form
   2,208.81/3,047.89 = 1,312.23/x
3. Step 3: Cross multiply
   2,208.81x = 3,047.89 × 1,312.23
4. Step 4: Simplify right side
   2,208.81x = 3,999,532.69
5. Step 5: Solve for x
   x = 3,999,532.69/2,208.81
6. Step 6: Final answer
   x = 1,810.72