Finding the Fourth Proportional to 1,358.86, 1,875.34 and 861.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,358.86 : 1,875.34 = 861.32 : x
2. Step 2: Convert to fraction form
   1,358.86/1,875.34 = 861.32/x
3. Step 3: Cross multiply
   1,358.86x = 1,875.34 × 861.32
4. Step 4: Simplify right side
   1,358.86x = 1,615,265.49
5. Step 5: Solve for x
   x = 1,615,265.49/1,358.86
6. Step 6: Final answer
   x = 1,188.69