Finding the Fourth Proportional to 1,210.72, 1,814.16 and 559.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,210.72 : 1,814.16 = 559.84 : x
2. Step 2: Convert to fraction form
   1,210.72/1,814.16 = 559.84/x
3. Step 3: Cross multiply
   1,210.72x = 1,814.16 × 559.84
4. Step 4: Simplify right side
   1,210.72x = 1,015,639.33
5. Step 5: Solve for x
   x = 1,015,639.33/1,210.72
6. Step 6: Final answer
   x = 838.87