Finding the Fourth Proportional to 72,448.89, 99,979.44 and 42,235.47

Step by Step Solution

1. Step 1: Write the proportion equation
   72,448.89 : 99,979.44 = 42,235.47 : x
2. Step 2: Convert to fraction form
   72,448.89/99,979.44 = 42,235.47/x
3. Step 3: Cross multiply
   72,448.89x = 99,979.44 × 42,235.47
4. Step 4: Simplify right side
   72,448.89x = 4,222,678,638.74
5. Step 5: Solve for x
   x = 4,222,678,638.74/72,448.89
6. Step 6: Final answer
   x = 58,284.93