Finding the Fourth Proportional to 1,978.21, 2,729.71 and 1,181.44

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.21 : 2,729.71 = 1,181.44 : x
2. Step 2: Convert to fraction form
   1,978.21/2,729.71 = 1,181.44/x
3. Step 3: Cross multiply
   1,978.21x = 2,729.71 × 1,181.44
4. Step 4: Simplify right side
   1,978.21x = 3,224,972.30
5. Step 5: Solve for x
   x = 3,224,972.30/1,978.21
6. Step 6: Final answer
   x = 1,630.25