Finding the Fourth Proportional to 1,360.05, 1,876.19 and 861.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,360.05 : 1,876.19 = 861.86 : x
2. Step 2: Convert to fraction form
   1,360.05/1,876.19 = 861.86/x
3. Step 3: Cross multiply
   1,360.05x = 1,876.19 × 861.86
4. Step 4: Simplify right side
   1,360.05x = 1,616,999.42
5. Step 5: Solve for x
   x = 1,616,999.42/1,360.05
6. Step 6: Final answer
   x = 1,188.93