Finding the Fourth Proportional to 21,002.41, 31,506.81 and 7,148.17

Step by Step Solution

1. Step 1: Write the proportion equation
   21,002.41 : 31,506.81 = 7,148.17 : x
2. Step 2: Convert to fraction form
   21,002.41/31,506.81 = 7,148.17/x
3. Step 3: Cross multiply
   21,002.41x = 31,506.81 × 7,148.17
4. Step 4: Simplify right side
   21,002.41x = 225,216,034.04
5. Step 5: Solve for x
   x = 225,216,034.04/21,002.41
6. Step 6: Final answer
   x = 10,723.34