Finding the Fourth Proportional to 115,791.09, 159,798.74 and 64,802.78

Step by Step Solution

1. Step 1: Write the proportion equation
   115,791.09 : 159,798.74 = 64,802.78 : x
2. Step 2: Convert to fraction form
   115,791.09/159,798.74 = 64,802.78/x
3. Step 3: Cross multiply
   115,791.09x = 159,798.74 × 64,802.78
4. Step 4: Simplify right side
   115,791.09x = 10,355,401,983.82
5. Step 5: Solve for x
   x = 10,355,401,983.82/115,791.09
6. Step 6: Final answer
   x = 89,431.77