Finding the Fourth Proportional to 1,520.85, 2,093.51 and 1,311.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,520.85 : 2,093.51 = 1,311.72 : x
2. Step 2: Convert to fraction form
   1,520.85/2,093.51 = 1,311.72/x
3. Step 3: Cross multiply
   1,520.85x = 2,093.51 × 1,311.72
4. Step 4: Simplify right side
   1,520.85x = 2,746,092.38
5. Step 5: Solve for x
   x = 2,746,092.38/1,520.85
6. Step 6: Final answer
   x = 1,805.63