Finding the Fourth Proportional to 2,261.58, 3,121.17 and 1,317.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,261.58 : 3,121.17 = 1,317.46 : x
2. Step 2: Convert to fraction form
   2,261.58/3,121.17 = 1,317.46/x
3. Step 3: Cross multiply
   2,261.58x = 3,121.17 × 1,317.46
4. Step 4: Simplify right side
   2,261.58x = 4,112,001.02
5. Step 5: Solve for x
   x = 4,112,001.02/2,261.58
6. Step 6: Final answer
   x = 1,818.20