Finding the Fourth Proportional to 1,535.53, 2,118.12 and 1,086.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,535.53 : 2,118.12 = 1,086.89 : x
2. Step 2: Convert to fraction form
   1,535.53/2,118.12 = 1,086.89/x
3. Step 3: Cross multiply
   1,535.53x = 2,118.12 × 1,086.89
4. Step 4: Simplify right side
   1,535.53x = 2,302,163.45
5. Step 5: Solve for x
   x = 2,302,163.45/1,535.53
6. Step 6: Final answer
   x = 1,499.26