Finding the Fourth Proportional to 1,917, 2,645.52 and 1,131.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,917 : 2,645.52 = 1,131.72 : x
2. Step 2: Convert to fraction form
   1,917/2,645.52 = 1,131.72/x
3. Step 3: Cross multiply
   1,917x = 2,645.52 × 1,131.72
4. Step 4: Simplify right side
   1,917x = 2,993,987.89
5. Step 5: Solve for x
   x = 2,993,987.89/1,917
6. Step 6: Final answer
   x = 1,561.81