Finding the Fourth Proportional to 1,524.51, 2,103.78 and 861.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,524.51 : 2,103.78 = 861.30 : x
2. Step 2: Convert to fraction form
   1,524.51/2,103.78 = 861.30/x
3. Step 3: Cross multiply
   1,524.51x = 2,103.78 × 861.30
4. Step 4: Simplify right side
   1,524.51x = 1,811,985.71
5. Step 5: Solve for x
   x = 1,811,985.71/1,524.51
6. Step 6: Final answer
   x = 1,188.57