Finding the Fourth Proportional to 21,007.98, 31,511.14 and 5,213.05

Step by Step Solution

1. Step 1: Write the proportion equation
   21,007.98 : 31,511.14 = 5,213.05 : x
2. Step 2: Convert to fraction form
   21,007.98/31,511.14 = 5,213.05/x
3. Step 3: Cross multiply
   21,007.98x = 31,511.14 × 5,213.05
4. Step 4: Simplify right side
   21,007.98x = 164,269,056.57
5. Step 5: Solve for x
   x = 164,269,056.57/21,007.98
6. Step 6: Final answer
   x = 7,819.36