Finding the Fourth Proportional to 115,906.25, 159,942.89 and 64,219.89

Step by Step Solution

1. Step 1: Write the proportion equation
   115,906.25 : 159,942.89 = 64,219.89 : x
2. Step 2: Convert to fraction form
   115,906.25/159,942.89 = 64,219.89/x
3. Step 3: Cross multiply
   115,906.25x = 159,942.89 × 64,219.89
4. Step 4: Simplify right side
   115,906.25x = 10,271,514,480.98
5. Step 5: Solve for x
   x = 10,271,514,480.98/115,906.25
6. Step 6: Final answer
   x = 88,619.16