Finding the Fourth Proportional to 12,783.30, 17,637.51 and 7,479.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,783.30 : 17,637.51 = 7,479.42 : x
2. Step 2: Convert to fraction form
   12,783.30/17,637.51 = 7,479.42/x
3. Step 3: Cross multiply
   12,783.30x = 17,637.51 × 7,479.42
4. Step 4: Simplify right side
   12,783.30x = 131,918,345.04
5. Step 5: Solve for x
   x = 131,918,345.04/12,783.30
6. Step 6: Final answer
   x = 10,319.58