Finding the Fourth Proportional to 1,531.53, 2,111.94 and 1,311.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,531.53 : 2,111.94 = 1,311.21 : x
2. Step 2: Convert to fraction form
   1,531.53/2,111.94 = 1,311.21/x
3. Step 3: Cross multiply
   1,531.53x = 2,111.94 × 1,311.21
4. Step 4: Simplify right side
   1,531.53x = 2,769,196.85
5. Step 5: Solve for x
   x = 2,769,196.85/1,531.53
6. Step 6: Final answer
   x = 1,808.12