Finding the Fourth Proportional to 1,386.84, 1,913.80 and 796.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.84 : 1,913.80 = 796.96 : x
2. Step 2: Convert to fraction form
   1,386.84/1,913.80 = 796.96/x
3. Step 3: Cross multiply
   1,386.84x = 1,913.80 × 796.96
4. Step 4: Simplify right side
   1,386.84x = 1,525,222.05
5. Step 5: Solve for x
   x = 1,525,222.05/1,386.84
6. Step 6: Final answer
   x = 1,099.78