Finding the Fourth Proportional to 2,261.55, 3,120.06 and 1,317.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,261.55 : 3,120.06 = 1,317.18 : x
2. Step 2: Convert to fraction form
   2,261.55/3,120.06 = 1,317.18/x
3. Step 3: Cross multiply
   2,261.55x = 3,120.06 × 1,317.18
4. Step 4: Simplify right side
   2,261.55x = 4,109,680.63
5. Step 5: Solve for x
   x = 4,109,680.63/2,261.55
6. Step 6: Final answer
   x = 1,817.20