Finding the Fourth Proportional to 1,851.06, 2,554.15 and 1,187.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,851.06 : 2,554.15 = 1,187.78 : x
2. Step 2: Convert to fraction form
   1,851.06/2,554.15 = 1,187.78/x
3. Step 3: Cross multiply
   1,851.06x = 2,554.15 × 1,187.78
4. Step 4: Simplify right side
   1,851.06x = 3,033,768.29
5. Step 5: Solve for x
   x = 3,033,768.29/1,851.06
6. Step 6: Final answer
   x = 1,638.94