Finding the Fourth Proportional to 2,091.72, 3,137.61 and 531.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,091.72 : 3,137.61 = 531.69 : x
2. Step 2: Convert to fraction form
   2,091.72/3,137.61 = 531.69/x
3. Step 3: Cross multiply
   2,091.72x = 3,137.61 × 531.69
4. Step 4: Simplify right side
   2,091.72x = 1,668,235.86
5. Step 5: Solve for x
   x = 1,668,235.86/2,091.72
6. Step 6: Final answer
   x = 797.54