Finding the Fourth Proportional to 12,172.69, 16,787.75 and 7,922.17

Step by Step Solution

1. Step 1: Write the proportion equation
   12,172.69 : 16,787.75 = 7,922.17 : x
2. Step 2: Convert to fraction form
   12,172.69/16,787.75 = 7,922.17/x
3. Step 3: Cross multiply
   12,172.69x = 16,787.75 × 7,922.17
4. Step 4: Simplify right side
   12,172.69x = 132,995,409.42
5. Step 5: Solve for x
   x = 132,995,409.42/12,172.69
6. Step 6: Final answer
   x = 10,925.72