Finding the Fourth Proportional to 1,854.05, 2,557.86 and 1,190.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,854.05 : 2,557.86 = 1,190.80 : x
2. Step 2: Convert to fraction form
   1,854.05/2,557.86 = 1,190.80/x
3. Step 3: Cross multiply
   1,854.05x = 2,557.86 × 1,190.80
4. Step 4: Simplify right side
   1,854.05x = 3,045,899.69
5. Step 5: Solve for x
   x = 3,045,899.69/1,854.05
6. Step 6: Final answer
   x = 1,642.84