Finding the Fourth Proportional to 1,535.52, 2,121.89 and 1,308.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,535.52 : 2,121.89 = 1,308.28 : x
2. Step 2: Convert to fraction form
   1,535.52/2,121.89 = 1,308.28/x
3. Step 3: Cross multiply
   1,535.52x = 2,121.89 × 1,308.28
4. Step 4: Simplify right side
   1,535.52x = 2,776,026.25
5. Step 5: Solve for x
   x = 2,776,026.25/1,535.52
6. Step 6: Final answer
   x = 1,807.87