Finding the Fourth Proportional to 13,612.72, 18,783.94 and 7,643.08

Step by Step Solution

1. Step 1: Write the proportion equation
   13,612.72 : 18,783.94 = 7,643.08 : x
2. Step 2: Convert to fraction form
   13,612.72/18,783.94 = 7,643.08/x
3. Step 3: Cross multiply
   13,612.72x = 18,783.94 × 7,643.08
4. Step 4: Simplify right side
   13,612.72x = 143,567,156.14
5. Step 5: Solve for x
   x = 143,567,156.14/13,612.72
6. Step 6: Final answer
   x = 10,546.54