Finding the Fourth Proportional to 1,359.29, 1,875.09 and 861.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.29 : 1,875.09 = 861.75 : x
2. Step 2: Convert to fraction form
   1,359.29/1,875.09 = 861.75/x
3. Step 3: Cross multiply
   1,359.29x = 1,875.09 × 861.75
4. Step 4: Simplify right side
   1,359.29x = 1,615,858.81
5. Step 5: Solve for x
   x = 1,615,858.81/1,359.29
6. Step 6: Final answer
   x = 1,188.75