Finding the Fourth Proportional to 115,973.88, 160,035.55 and 64,979.42

Step by Step Solution

1. Step 1: Write the proportion equation
   115,973.88 : 160,035.55 = 64,979.42 : x
2. Step 2: Convert to fraction form
   115,973.88/160,035.55 = 64,979.42/x
3. Step 3: Cross multiply
   115,973.88x = 160,035.55 × 64,979.42
4. Step 4: Simplify right side
   115,973.88x = 10,399,016,255.75
5. Step 5: Solve for x
   x = 10,399,016,255.75/115,973.88
6. Step 6: Final answer
   x = 89,666.89