Finding the Fourth Proportional to 72,356.96, 99,851.72 and 42,147.20

Step by Step Solution

1. Step 1: Write the proportion equation
   72,356.96 : 99,851.72 = 42,147.20 : x
2. Step 2: Convert to fraction form
   72,356.96/99,851.72 = 42,147.20/x
3. Step 3: Cross multiply
   72,356.96x = 99,851.72 × 42,147.20
4. Step 4: Simplify right side
   72,356.96x = 4,208,470,413.18
5. Step 5: Solve for x
   x = 4,208,470,413.18/72,356.96
6. Step 6: Final answer
   x = 58,162.62