Finding the Fourth Proportional to 72,244.86, 99,696.42 and 39,979.47

Step by Step Solution

1. Step 1: Write the proportion equation
   72,244.86 : 99,696.42 = 39,979.47 : x
2. Step 2: Convert to fraction form
   72,244.86/99,696.42 = 39,979.47/x
3. Step 3: Cross multiply
   72,244.86x = 99,696.42 × 39,979.47
4. Step 4: Simplify right side
   72,244.86x = 3,985,810,406.36
5. Step 5: Solve for x
   x = 3,985,810,406.36/72,244.86
6. Step 6: Final answer
   x = 55,170.85