Finding the Fourth Proportional to 13,168.76, 18,172.89 and 7,200.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,168.76 : 18,172.89 = 7,200.42 : x
2. Step 2: Convert to fraction form
   13,168.76/18,172.89 = 7,200.42/x
3. Step 3: Cross multiply
   13,168.76x = 18,172.89 × 7,200.42
4. Step 4: Simplify right side
   13,168.76x = 130,852,440.61
5. Step 5: Solve for x
   x = 130,852,440.61/13,168.76
6. Step 6: Final answer
   x = 9,936.58