Finding the Fourth Proportional to 11,931.31, 16,462.59 and 7,215.49

Step by Step Solution

1. Step 1: Write the proportion equation
   11,931.31 : 16,462.59 = 7,215.49 : x
2. Step 2: Convert to fraction form
   11,931.31/16,462.59 = 7,215.49/x
3. Step 3: Cross multiply
   11,931.31x = 16,462.59 × 7,215.49
4. Step 4: Simplify right side
   11,931.31x = 118,785,653.52
5. Step 5: Solve for x
   x = 118,785,653.52/11,931.31
6. Step 6: Final answer
   x = 9,955.79