Finding the Fourth Proportional to 117,336.16, 161,945.22 and 76,978.72

Step by Step Solution

1. Step 1: Write the proportion equation
   117,336.16 : 161,945.22 = 76,978.72 : x
2. Step 2: Convert to fraction form
   117,336.16/161,945.22 = 76,978.72/x
3. Step 3: Cross multiply
   117,336.16x = 161,945.22 × 76,978.72
4. Step 4: Simplify right side
   117,336.16x = 12,466,335,745.72
5. Step 5: Solve for x
   x = 12,466,335,745.72/117,336.16
6. Step 6: Final answer
   x = 106,244.62