Finding the Fourth Proportional to 1,387.74, 1,914.87 and 863.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.74 : 1,914.87 = 863.82 : x
2. Step 2: Convert to fraction form
   1,387.74/1,914.87 = 863.82/x
3. Step 3: Cross multiply
   1,387.74x = 1,914.87 × 863.82
4. Step 4: Simplify right side
   1,387.74x = 1,654,103.00
5. Step 5: Solve for x
   x = 1,654,103.00/1,387.74
6. Step 6: Final answer
   x = 1,191.94