Finding the Fourth Proportional to 115,981.60, 160,067.85 and 65,008.07

Step by Step Solution

1. Step 1: Write the proportion equation
   115,981.60 : 160,067.85 = 65,008.07 : x
2. Step 2: Convert to fraction form
   115,981.60/160,067.85 = 65,008.07/x
3. Step 3: Cross multiply
   115,981.60x = 160,067.85 × 65,008.07
4. Step 4: Simplify right side
   115,981.60x = 10,405,701,997.55
5. Step 5: Solve for x
   x = 10,405,701,997.55/115,981.60
6. Step 6: Final answer
   x = 89,718.56