Finding the Fourth Proportional to 1,388.62, 1,916.49 and 799.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.62 : 1,916.49 = 799.14 : x
2. Step 2: Convert to fraction form
   1,388.62/1,916.49 = 799.14/x
3. Step 3: Cross multiply
   1,388.62x = 1,916.49 × 799.14
4. Step 4: Simplify right side
   1,388.62x = 1,531,543.82
5. Step 5: Solve for x
   x = 1,531,543.82/1,388.62
6. Step 6: Final answer
   x = 1,102.93