Finding the Fourth Proportional to 9,405.25, 12,979.32 and 5,213.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,405.25 : 12,979.32 = 5,213.50 : x
2. Step 2: Convert to fraction form
   9,405.25/12,979.32 = 5,213.50/x
3. Step 3: Cross multiply
   9,405.25x = 12,979.32 × 5,213.50
4. Step 4: Simplify right side
   9,405.25x = 67,667,684.82
5. Step 5: Solve for x
   x = 67,667,684.82/9,405.25
6. Step 6: Final answer
   x = 7,194.67