Finding the Fourth Proportional to 1,395.58, 1,925.40 and 863.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,395.58 : 1,925.40 = 863.86 : x
2. Step 2: Convert to fraction form
   1,395.58/1,925.40 = 863.86/x
3. Step 3: Cross multiply
   1,395.58x = 1,925.40 × 863.86
4. Step 4: Simplify right side
   1,395.58x = 1,663,276.04
5. Step 5: Solve for x
   x = 1,663,276.04/1,395.58
6. Step 6: Final answer
   x = 1,191.82