Finding the Fourth Proportional to 1,396.72, 1,927.33 and 807.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.72 : 1,927.33 = 807.45 : x
2. Step 2: Convert to fraction form
   1,396.72/1,927.33 = 807.45/x
3. Step 3: Cross multiply
   1,396.72x = 1,927.33 × 807.45
4. Step 4: Simplify right side
   1,396.72x = 1,556,222.61
5. Step 5: Solve for x
   x = 1,556,222.61/1,396.72
6. Step 6: Final answer
   x = 1,114.20