Finding the Fourth Proportional to 21,318.83, 31,978.35 and 5,522.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,318.83 : 31,978.35 = 5,522.76 : x
2. Step 2: Convert to fraction form
   21,318.83/31,978.35 = 5,522.76/x
3. Step 3: Cross multiply
   21,318.83x = 31,978.35 × 5,522.76
4. Step 4: Simplify right side
   21,318.83x = 176,608,752.25
5. Step 5: Solve for x
   x = 176,608,752.25/21,318.83
6. Step 6: Final answer
   x = 8,284.17