Finding the Fourth Proportional to 9,386.51, 12,956.63 and 5,409.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,386.51 : 12,956.63 = 5,409.21 : x
2. Step 2: Convert to fraction form
   9,386.51/12,956.63 = 5,409.21/x
3. Step 3: Cross multiply
   9,386.51x = 12,956.63 × 5,409.21
4. Step 4: Simplify right side
   9,386.51x = 70,085,105.52
5. Step 5: Solve for x
   x = 70,085,105.52/9,386.51
6. Step 6: Final answer
   x = 7,466.58