Finding the Fourth Proportional to 13,212.72, 18,234.30 and 7,838.34

Step by Step Solution

1. Step 1: Write the proportion equation
   13,212.72 : 18,234.30 = 7,838.34 : x
2. Step 2: Convert to fraction form
   13,212.72/18,234.30 = 7,838.34/x
3. Step 3: Cross multiply
   13,212.72x = 18,234.30 × 7,838.34
4. Step 4: Simplify right side
   13,212.72x = 142,926,643.06
5. Step 5: Solve for x
   x = 142,926,643.06/13,212.72
6. Step 6: Final answer
   x = 10,817.35