Finding the Fourth Proportional to 345,105.78, 517,633.90 and 108,516.12

Step by Step Solution

1. Step 1: Write the proportion equation
   345,105.78 : 517,633.90 = 108,516.12 : x
2. Step 2: Convert to fraction form
   345,105.78/517,633.90 = 108,516.12/x
3. Step 3: Cross multiply
   345,105.78x = 517,633.90 × 108,516.12
4. Step 4: Simplify right side
   345,105.78x = 56,171,622,408.47
5. Step 5: Solve for x
   x = 56,171,622,408.47/345,105.78
6. Step 6: Final answer
   x = 162,766.39