Finding the Fourth Proportional to 1,388.03, 1,916.00 and 863.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.03 : 1,916.00 = 863.96 : x
2. Step 2: Convert to fraction form
   1,388.03/1,916.00 = 863.96/x
3. Step 3: Cross multiply
   1,388.03x = 1,916.00 × 863.96
4. Step 4: Simplify right side
   1,388.03x = 1,655,333.46
5. Step 5: Solve for x
   x = 1,655,333.46/1,388.03
6. Step 6: Final answer
   x = 1,192.58