Finding the Fourth Proportional to 1,386.86, 1,913.78 and 796.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.86 : 1,913.78 = 796.98 : x
2. Step 2: Convert to fraction form
   1,386.86/1,913.78 = 796.98/x
3. Step 3: Cross multiply
   1,386.86x = 1,913.78 × 796.98
4. Step 4: Simplify right side
   1,386.86x = 1,525,244.38
5. Step 5: Solve for x
   x = 1,525,244.38/1,386.86
6. Step 6: Final answer
   x = 1,099.78