Finding the Fourth Proportional to 1,396.72, 1,927.42 and 807.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.72 : 1,927.42 = 807.13 : x
2. Step 2: Convert to fraction form
   1,396.72/1,927.42 = 807.13/x
3. Step 3: Cross multiply
   1,396.72x = 1,927.42 × 807.13
4. Step 4: Simplify right side
   1,396.72x = 1,555,678.50
5. Step 5: Solve for x
   x = 1,555,678.50/1,396.72
6. Step 6: Final answer
   x = 1,113.81