Finding the Fourth Proportional to 1,358.05, 1,875.27 and 861.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,358.05 : 1,875.27 = 861.57 : x
2. Step 2: Convert to fraction form
   1,358.05/1,875.27 = 861.57/x
3. Step 3: Cross multiply
   1,358.05x = 1,875.27 × 861.57
4. Step 4: Simplify right side
   1,358.05x = 1,615,676.37
5. Step 5: Solve for x
   x = 1,615,676.37/1,358.05
6. Step 6: Final answer
   x = 1,189.70