Finding the Fourth Proportional to 1,436.76, 2,155.32 and 559.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.76 : 2,155.32 = 559.28 : x
2. Step 2: Convert to fraction form
   1,436.76/2,155.32 = 559.28/x
3. Step 3: Cross multiply
   1,436.76x = 2,155.32 × 559.28
4. Step 4: Simplify right side
   1,436.76x = 1,205,427.37
5. Step 5: Solve for x
   x = 1,205,427.37/1,436.76
6. Step 6: Final answer
   x = 838.99