Finding the Fourth Proportional to 1,521.72, 2,284.54 and 791.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.72 : 2,284.54 = 791.80 : x
2. Step 2: Convert to fraction form
   1,521.72/2,284.54 = 791.80/x
3. Step 3: Cross multiply
   1,521.72x = 2,284.54 × 791.80
4. Step 4: Simplify right side
   1,521.72x = 1,808,898.77
5. Step 5: Solve for x
   x = 1,808,898.77/1,521.72
6. Step 6: Final answer
   x = 1,188.72