Finding the Fourth Proportional to 1,441.12, 1,988.56 and 1,178.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,441.12 : 1,988.56 = 1,178.72 : x
2. Step 2: Convert to fraction form
   1,441.12/1,988.56 = 1,178.72/x
3. Step 3: Cross multiply
   1,441.12x = 1,988.56 × 1,178.72
4. Step 4: Simplify right side
   1,441.12x = 2,343,955.44
5. Step 5: Solve for x
   x = 2,343,955.44/1,441.12
6. Step 6: Final answer
   x = 1,626.48