Finding the Fourth Proportional to 2,307.89, 3,185.07 and 1,313.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,307.89 : 3,185.07 = 1,313.21 : x
2. Step 2: Convert to fraction form
   2,307.89/3,185.07 = 1,313.21/x
3. Step 3: Cross multiply
   2,307.89x = 3,185.07 × 1,313.21
4. Step 4: Simplify right side
   2,307.89x = 4,182,665.77
5. Step 5: Solve for x
   x = 4,182,665.77/2,307.89
6. Step 6: Final answer
   x = 1,812.33