Finding the Fourth Proportional to 9,171.18, 12,655.89 and 4,979.34

Step by Step Solution

1. Step 1: Write the proportion equation
   9,171.18 : 12,655.89 = 4,979.34 : x
2. Step 2: Convert to fraction form
   9,171.18/12,655.89 = 4,979.34/x
3. Step 3: Cross multiply
   9,171.18x = 12,655.89 × 4,979.34
4. Step 4: Simplify right side
   9,171.18x = 63,017,979.31
5. Step 5: Solve for x
   x = 63,017,979.31/9,171.18
6. Step 6: Final answer
   x = 6,871.31