Finding the Fourth Proportional to 1,284.72, 1,926.66 and 553.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,284.72 : 1,926.66 = 553.84 : x
2. Step 2: Convert to fraction form
   1,284.72/1,926.66 = 553.84/x
3. Step 3: Cross multiply
   1,284.72x = 1,926.66 × 553.84
4. Step 4: Simplify right side
   1,284.72x = 1,067,061.37
5. Step 5: Solve for x
   x = 1,067,061.37/1,284.72
6. Step 6: Final answer
   x = 830.58