Finding the Fourth Proportional to 21,213, 31,819.61 and 7,173.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,213 : 31,819.61 = 7,173.12 : x
2. Step 2: Convert to fraction form
   21,213/31,819.61 = 7,173.12/x
3. Step 3: Cross multiply
   21,213x = 31,819.61 × 7,173.12
4. Step 4: Simplify right side
   21,213x = 228,245,845.02
5. Step 5: Solve for x
   x = 228,245,845.02/21,213
6. Step 6: Final answer
   x = 10,759.72