Finding the Fourth Proportional to 115,718.72, 159,698.72 and 65,422.40

Step by Step Solution

1. Step 1: Write the proportion equation
   115,718.72 : 159,698.72 = 65,422.40 : x
2. Step 2: Convert to fraction form
   115,718.72/159,698.72 = 65,422.40/x
3. Step 3: Cross multiply
   115,718.72x = 159,698.72 × 65,422.40
4. Step 4: Simplify right side
   115,718.72x = 10,447,873,539.33
5. Step 5: Solve for x
   x = 10,447,873,539.33/115,718.72
6. Step 6: Final answer
   x = 90,286.81