Finding the Fourth Proportional to 2,259.50, 3,117.89 and 1,315.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,259.50 : 3,117.89 = 1,315.85 : x
2. Step 2: Convert to fraction form
   2,259.50/3,117.89 = 1,315.85/x
3. Step 3: Cross multiply
   2,259.50x = 3,117.89 × 1,315.85
4. Step 4: Simplify right side
   2,259.50x = 4,102,663.26
5. Step 5: Solve for x
   x = 4,102,663.26/2,259.50
6. Step 6: Final answer
   x = 1,815.74