Finding the Fourth Proportional to 12,071.76, 16,643.46 and 7,815.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,071.76 : 16,643.46 = 7,815.28 : x
2. Step 2: Convert to fraction form
   12,071.76/16,643.46 = 7,815.28/x
3. Step 3: Cross multiply
   12,071.76x = 16,643.46 × 7,815.28
4. Step 4: Simplify right side
   12,071.76x = 130,073,300.07
5. Step 5: Solve for x
   x = 130,073,300.07/12,071.76
6. Step 6: Final answer
   x = 10,775.01