Finding the Fourth Proportional to 2,261.72, 3,120.96 and 1,317.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,261.72 : 3,120.96 = 1,317.53 : x
2. Step 2: Convert to fraction form
   2,261.72/3,120.96 = 1,317.53/x
3. Step 3: Cross multiply
   2,261.72x = 3,120.96 × 1,317.53
4. Step 4: Simplify right side
   2,261.72x = 4,111,971.17
5. Step 5: Solve for x
   x = 4,111,971.17/2,261.72
6. Step 6: Final answer
   x = 1,818.07