Finding the Fourth Proportional to 12,179.28, 18,270.83 and 5,159.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,179.28 : 18,270.83 = 5,159.31 : x
2. Step 2: Convert to fraction form
   12,179.28/18,270.83 = 5,159.31/x
3. Step 3: Cross multiply
   12,179.28x = 18,270.83 × 5,159.31
4. Step 4: Simplify right side
   12,179.28x = 94,264,875.93
5. Step 5: Solve for x
   x = 94,264,875.93/12,179.28
6. Step 6: Final answer
   x = 7,739.77