Finding the Fourth Proportional to 1,396.63, 1,927.56 and 807.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.63 : 1,927.56 = 807.15 : x
2. Step 2: Convert to fraction form
   1,396.63/1,927.56 = 807.15/x
3. Step 3: Cross multiply
   1,396.63x = 1,927.56 × 807.15
4. Step 4: Simplify right side
   1,396.63x = 1,555,830.05
5. Step 5: Solve for x
   x = 1,555,830.05/1,396.63
6. Step 6: Final answer
   x = 1,113.99