Finding the Fourth Proportional to 9,171.16, 12,656.28 and 4,979.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,171.16 : 12,656.28 = 4,979.42 : x
2. Step 2: Convert to fraction form
   9,171.16/12,656.28 = 4,979.42/x
3. Step 3: Cross multiply
   9,171.16x = 12,656.28 × 4,979.42
4. Step 4: Simplify right side
   9,171.16x = 63,020,933.76
5. Step 5: Solve for x
   x = 63,020,933.76/9,171.16
6. Step 6: Final answer
   x = 6,871.64