Finding the Fourth Proportional to 72,152.48, 99,570.12 and 40,321.37

Step by Step Solution

1. Step 1: Write the proportion equation
   72,152.48 : 99,570.12 = 40,321.37 : x
2. Step 2: Convert to fraction form
   72,152.48/99,570.12 = 40,321.37/x
3. Step 3: Cross multiply
   72,152.48x = 99,570.12 × 40,321.37
4. Step 4: Simplify right side
   72,152.48x = 4,014,803,151.61
5. Step 5: Solve for x
   x = 4,014,803,151.61/72,152.48
6. Step 6: Final answer
   x = 55,643.32