Finding the Fourth Proportional to 1,524.32, 2,103.56 and 861.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,524.32 : 2,103.56 = 861.21 : x
2. Step 2: Convert to fraction form
   1,524.32/2,103.56 = 861.21/x
3. Step 3: Cross multiply
   1,524.32x = 2,103.56 × 861.21
4. Step 4: Simplify right side
   1,524.32x = 1,811,606.91
5. Step 5: Solve for x
   x = 1,811,606.91/1,524.32
6. Step 6: Final answer
   x = 1,188.47