Finding the Fourth Proportional to 1,396.18, 1,926.96 and 807.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.18 : 1,926.96 = 807.05 : x
2. Step 2: Convert to fraction form
   1,396.18/1,926.96 = 807.05/x
3. Step 3: Cross multiply
   1,396.18x = 1,926.96 × 807.05
4. Step 4: Simplify right side
   1,396.18x = 1,555,163.01
5. Step 5: Solve for x
   x = 1,555,163.01/1,396.18
6. Step 6: Final answer
   x = 1,113.87