Finding the Fourth Proportional to 1,788.78, 2,467.41 and 1,191.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,788.78 : 2,467.41 = 1,191.30 : x
2. Step 2: Convert to fraction form
   1,788.78/2,467.41 = 1,191.30/x
3. Step 3: Cross multiply
   1,788.78x = 2,467.41 × 1,191.30
4. Step 4: Simplify right side
   1,788.78x = 2,939,425.53
5. Step 5: Solve for x
   x = 2,939,425.53/1,788.78
6. Step 6: Final answer
   x = 1,643.26