Finding the Fourth Proportional to 85,778.78, 128,676.71 and 35,874.50

Step by Step Solution

1. Step 1: Write the proportion equation
   85,778.78 : 128,676.71 = 35,874.50 : x
2. Step 2: Convert to fraction form
   85,778.78/128,676.71 = 35,874.50/x
3. Step 3: Cross multiply
   85,778.78x = 128,676.71 × 35,874.50
4. Step 4: Simplify right side
   85,778.78x = 4,616,212,079.20
5. Step 5: Solve for x
   x = 4,616,212,079.20/85,778.78
6. Step 6: Final answer
   x = 53,815.32