Finding the Fourth Proportional to 12,783.43, 17,641.20 and 7,477.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,783.43 : 17,641.20 = 7,477.21 : x
2. Step 2: Convert to fraction form
   12,783.43/17,641.20 = 7,477.21/x
3. Step 3: Cross multiply
   12,783.43x = 17,641.20 × 7,477.21
4. Step 4: Simplify right side
   12,783.43x = 131,906,957.05
5. Step 5: Solve for x
   x = 131,906,957.05/12,783.43
6. Step 6: Final answer
   x = 10,318.59