Finding the Fourth Proportional to 1,533.92, 2,118.31 and 1,311.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,533.92 : 2,118.31 = 1,311.58 : x
2. Step 2: Convert to fraction form
   1,533.92/2,118.31 = 1,311.58/x
3. Step 3: Cross multiply
   1,533.92x = 2,118.31 × 1,311.58
4. Step 4: Simplify right side
   1,533.92x = 2,778,333.03
5. Step 5: Solve for x
   x = 2,778,333.03/1,533.92
6. Step 6: Final answer
   x = 1,811.26