Finding the Fourth Proportional to 8,112.42, 12,172.95 and 3,495.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,112.42 : 12,172.95 = 3,495.78 : x
2. Step 2: Convert to fraction form
   8,112.42/12,172.95 = 3,495.78/x
3. Step 3: Cross multiply
   8,112.42x = 12,172.95 × 3,495.78
4. Step 4: Simplify right side
   8,112.42x = 42,553,955.15
5. Step 5: Solve for x
   x = 42,553,955.15/8,112.42
6. Step 6: Final answer
   x = 5,245.53