Finding the Fourth Proportional to 2,308.55, 3,185.79 and 1,313.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,308.55 : 3,185.79 = 1,313.90 : x
2. Step 2: Convert to fraction form
   2,308.55/3,185.79 = 1,313.90/x
3. Step 3: Cross multiply
   2,308.55x = 3,185.79 × 1,313.90
4. Step 4: Simplify right side
   2,308.55x = 4,185,793.55
5. Step 5: Solve for x
   x = 4,185,793.55/2,308.55
6. Step 6: Final answer
   x = 1,813.17