Finding the Fourth Proportional to 10,912.91, 16,356.42 and 4,980.69

Step by Step Solution

1. Step 1: Write the proportion equation
   10,912.91 : 16,356.42 = 4,980.69 : x
2. Step 2: Convert to fraction form
   10,912.91/16,356.42 = 4,980.69/x
3. Step 3: Cross multiply
   10,912.91x = 16,356.42 × 4,980.69
4. Step 4: Simplify right side
   10,912.91x = 81,466,257.53
5. Step 5: Solve for x
   x = 81,466,257.53/10,912.91
6. Step 6: Final answer
   x = 7,465.13