Finding the Fourth Proportional to 1,386.82, 1,913.88 and 863.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.82 : 1,913.88 = 863.02 : x
2. Step 2: Convert to fraction form
   1,386.82/1,913.88 = 863.02/x
3. Step 3: Cross multiply
   1,386.82x = 1,913.88 × 863.02
4. Step 4: Simplify right side
   1,386.82x = 1,651,716.72
5. Step 5: Solve for x
   x = 1,651,716.72/1,386.82
6. Step 6: Final answer
   x = 1,191.01