Finding the Fourth Proportional to 9,405.35, 12,979.54 and 5,156.33

Step by Step Solution

1. Step 1: Write the proportion equation
   9,405.35 : 12,979.54 = 5,156.33 : x
2. Step 2: Convert to fraction form
   9,405.35/12,979.54 = 5,156.33/x
3. Step 3: Cross multiply
   9,405.35x = 12,979.54 × 5,156.33
4. Step 4: Simplify right side
   9,405.35x = 66,926,733.04
5. Step 5: Solve for x
   x = 66,926,733.04/9,405.35
6. Step 6: Final answer
   x = 7,115.82