Finding the Fourth Proportional to 7,168.78, 9,892.72 and 3,981.98

Step by Step Solution

1. Step 1: Write the proportion equation
   7,168.78 : 9,892.72 = 3,981.98 : x
2. Step 2: Convert to fraction form
   7,168.78/9,892.72 = 3,981.98/x
3. Step 3: Cross multiply
   7,168.78x = 9,892.72 × 3,981.98
4. Step 4: Simplify right side
   7,168.78x = 39,392,613.19
5. Step 5: Solve for x
   x = 39,392,613.19/7,168.78
6. Step 6: Final answer
   x = 5,495.02