Finding the Fourth Proportional to 1,917.57, 2,646.15 and 1,131.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,917.57 : 2,646.15 = 1,131.48 : x
2. Step 2: Convert to fraction form
   1,917.57/2,646.15 = 1,131.48/x
3. Step 3: Cross multiply
   1,917.57x = 2,646.15 × 1,131.48
4. Step 4: Simplify right side
   1,917.57x = 2,994,065.80
5. Step 5: Solve for x
   x = 2,994,065.80/1,917.57
6. Step 6: Final answer
   x = 1,561.39