Finding the Fourth Proportional to 1,853.16, 2,557.72 and 1,190.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,853.16 : 2,557.72 = 1,190.85 : x
2. Step 2: Convert to fraction form
   1,853.16/2,557.72 = 1,190.85/x
3. Step 3: Cross multiply
   1,853.16x = 2,557.72 × 1,190.85
4. Step 4: Simplify right side
   1,853.16x = 3,045,860.86
5. Step 5: Solve for x
   x = 3,045,860.86/1,853.16
6. Step 6: Final answer
   x = 1,643.60