Finding the Fourth Proportional to 9,384.81, 12,936.15 and 7,392.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,384.81 : 12,936.15 = 7,392.21 : x
2. Step 2: Convert to fraction form
   9,384.81/12,936.15 = 7,392.21/x
3. Step 3: Cross multiply
   9,384.81x = 12,936.15 × 7,392.21
4. Step 4: Simplify right side
   9,384.81x = 95,626,737.39
5. Step 5: Solve for x
   x = 95,626,737.39/9,384.81
6. Step 6: Final answer
   x = 10,189.52