Finding the Fourth Proportional to 12,164.72, 16,787.40 and 7,129.08

Step by Step Solution

1. Step 1: Write the proportion equation
   12,164.72 : 16,787.40 = 7,129.08 : x
2. Step 2: Convert to fraction form
   12,164.72/16,787.40 = 7,129.08/x
3. Step 3: Cross multiply
   12,164.72x = 16,787.40 × 7,129.08
4. Step 4: Simplify right side
   12,164.72x = 119,678,717.59
5. Step 5: Solve for x
   x = 119,678,717.59/12,164.72
6. Step 6: Final answer
   x = 9,838.19