Finding the Fourth Proportional to 1,386.56, 1,913.54 and 797.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.56 : 1,913.54 = 797.10 : x
2. Step 2: Convert to fraction form
   1,386.56/1,913.54 = 797.10/x
3. Step 3: Cross multiply
   1,386.56x = 1,913.54 × 797.10
4. Step 4: Simplify right side
   1,386.56x = 1,525,278.75
5. Step 5: Solve for x
   x = 1,525,278.75/1,386.56
6. Step 6: Final answer
   x = 1,100.05