Finding the Fourth Proportional to 11,931.81, 16,463.28 and 7,215.99

Step by Step Solution

1. Step 1: Write the proportion equation
   11,931.81 : 16,463.28 = 7,215.99 : x
2. Step 2: Convert to fraction form
   11,931.81/16,463.28 = 7,215.99/x
3. Step 3: Cross multiply
   11,931.81x = 16,463.28 × 7,215.99
4. Step 4: Simplify right side
   11,931.81x = 118,798,863.85
5. Step 5: Solve for x
   x = 118,798,863.85/11,931.81
6. Step 6: Final answer
   x = 9,956.48