Finding the Fourth Proportional to 21,124.72, 31,689.96 and 7,270

Step by Step Solution

1. Step 1: Write the proportion equation
   21,124.72 : 31,689.96 = 7,270 : x
2. Step 2: Convert to fraction form
   21,124.72/31,689.96 = 7,270/x
3. Step 3: Cross multiply
   21,124.72x = 31,689.96 × 7,270
4. Step 4: Simplify right side
   21,124.72x = 230,386,009.20
5. Step 5: Solve for x
   x = 230,386,009.20/21,124.72
6. Step 6: Final answer
   x = 10,905.99