Finding the Fourth Proportional to 1,421.03, 1,961.40 and 861.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.03 : 1,961.40 = 861.52 : x
2. Step 2: Convert to fraction form
   1,421.03/1,961.40 = 861.52/x
3. Step 3: Cross multiply
   1,421.03x = 1,961.40 × 861.52
4. Step 4: Simplify right side
   1,421.03x = 1,689,785.33
5. Step 5: Solve for x
   x = 1,689,785.33/1,421.03
6. Step 6: Final answer
   x = 1,189.13