Finding the Fourth Proportional to 1,359.56, 1,875.48 and 861.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.56 : 1,875.48 = 861.34 : x
2. Step 2: Convert to fraction form
   1,359.56/1,875.48 = 861.34/x
3. Step 3: Cross multiply
   1,359.56x = 1,875.48 × 861.34
4. Step 4: Simplify right side
   1,359.56x = 1,615,425.94
5. Step 5: Solve for x
   x = 1,615,425.94/1,359.56
6. Step 6: Final answer
   x = 1,188.20