Finding the Fourth Proportional to 1,358.31, 1,875.61 and 861.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,358.31 : 1,875.61 = 861.83 : x
2. Step 2: Convert to fraction form
   1,358.31/1,875.61 = 861.83/x
3. Step 3: Cross multiply
   1,358.31x = 1,875.61 × 861.83
4. Step 4: Simplify right side
   1,358.31x = 1,616,447.59
5. Step 5: Solve for x
   x = 1,616,447.59/1,358.31
6. Step 6: Final answer
   x = 1,190.05