Finding the Fourth Proportional to 1,528.72, 2,103.24 and 1,178.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,528.72 : 2,103.24 = 1,178.80 : x
2. Step 2: Convert to fraction form
   1,528.72/2,103.24 = 1,178.80/x
3. Step 3: Cross multiply
   1,528.72x = 2,103.24 × 1,178.80
4. Step 4: Simplify right side
   1,528.72x = 2,479,299.31
5. Step 5: Solve for x
   x = 2,479,299.31/1,528.72
6. Step 6: Final answer
   x = 1,621.81