Finding the Fourth Proportional to 1,359.46, 1,875.30 and 861.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.46 : 1,875.30 = 861.91 : x
2. Step 2: Convert to fraction form
   1,359.46/1,875.30 = 861.91/x
3. Step 3: Cross multiply
   1,359.46x = 1,875.30 × 861.91
4. Step 4: Simplify right side
   1,359.46x = 1,616,339.82
5. Step 5: Solve for x
   x = 1,616,339.82/1,359.46
6. Step 6: Final answer
   x = 1,188.96