Finding the Fourth Proportional to 21,001.58, 31,490.72 and 8,338.49

Step by Step Solution

1. Step 1: Write the proportion equation
   21,001.58 : 31,490.72 = 8,338.49 : x
2. Step 2: Convert to fraction form
   21,001.58/31,490.72 = 8,338.49/x
3. Step 3: Cross multiply
   21,001.58x = 31,490.72 × 8,338.49
4. Step 4: Simplify right side
   21,001.58x = 262,585,228.07
5. Step 5: Solve for x
   x = 262,585,228.07/21,001.58
6. Step 6: Final answer
   x = 12,503.12