Finding the Fourth Proportional to 1,359.64, 1,875.58 and 861.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.64 : 1,875.58 = 861.42 : x
2. Step 2: Convert to fraction form
   1,359.64/1,875.58 = 861.42/x
3. Step 3: Cross multiply
   1,359.64x = 1,875.58 × 861.42
4. Step 4: Simplify right side
   1,359.64x = 1,615,662.12
5. Step 5: Solve for x
   x = 1,615,662.12/1,359.64
6. Step 6: Final answer
   x = 1,188.30