Finding the Fourth Proportional to 1,851.60, 2,555.56 and 1,189.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,851.60 : 2,555.56 = 1,189.29 : x
2. Step 2: Convert to fraction form
   1,851.60/2,555.56 = 1,189.29/x
3. Step 3: Cross multiply
   1,851.60x = 2,555.56 × 1,189.29
4. Step 4: Simplify right side
   1,851.60x = 3,039,301.95
5. Step 5: Solve for x
   x = 3,039,301.95/1,851.60
6. Step 6: Final answer
   x = 1,641.45