Finding the Fourth Proportional to 1,072.84, 1,610.72 and 553.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.84 : 1,610.72 = 553.27 : x
2. Step 2: Convert to fraction form
   1,072.84/1,610.72 = 553.27/x
3. Step 3: Cross multiply
   1,072.84x = 1,610.72 × 553.27
4. Step 4: Simplify right side
   1,072.84x = 891,152.23
5. Step 5: Solve for x
   x = 891,152.23/1,072.84
6. Step 6: Final answer
   x = 830.65