Finding the Fourth Proportional to 115,615.48, 159,557.16 and 65,317.72

Step by Step Solution

1. Step 1: Write the proportion equation
   115,615.48 : 159,557.16 = 65,317.72 : x
2. Step 2: Convert to fraction form
   115,615.48/159,557.16 = 65,317.72/x
3. Step 3: Cross multiply
   115,615.48x = 159,557.16 × 65,317.72
4. Step 4: Simplify right side
   115,615.48x = 10,421,909,900.88
5. Step 5: Solve for x
   x = 10,421,909,900.88/115,615.48
6. Step 6: Final answer
   x = 90,142.86