Finding the Fourth Proportional to 1,851.67, 2,555.03 and 1,188.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,851.67 : 2,555.03 = 1,188.61 : x
2. Step 2: Convert to fraction form
   1,851.67/2,555.03 = 1,188.61/x
3. Step 3: Cross multiply
   1,851.67x = 2,555.03 × 1,188.61
4. Step 4: Simplify right side
   1,851.67x = 3,036,928.27
5. Step 5: Solve for x
   x = 3,036,928.27/1,851.67
6. Step 6: Final answer
   x = 1,640.10