Finding the Fourth Proportional to 2,311.61, 3,190.29 and 1,317.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,311.61 : 3,190.29 = 1,317.05 : x
2. Step 2: Convert to fraction form
   2,311.61/3,190.29 = 1,317.05/x
3. Step 3: Cross multiply
   2,311.61x = 3,190.29 × 1,317.05
4. Step 4: Simplify right side
   2,311.61x = 4,201,762.52
5. Step 5: Solve for x
   x = 4,201,762.52/2,311.61
6. Step 6: Final answer
   x = 1,817.68