Finding the Fourth Proportional to 1,322.82, 1,985.31 and 553.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,322.82 : 1,985.31 = 553.86 : x
2. Step 2: Convert to fraction form
   1,322.82/1,985.31 = 553.86/x
3. Step 3: Cross multiply
   1,322.82x = 1,985.31 × 553.86
4. Step 4: Simplify right side
   1,322.82x = 1,099,583.80
5. Step 5: Solve for x
   x = 1,099,583.80/1,322.82
6. Step 6: Final answer
   x = 831.24