Finding the Fourth Proportional to 72,151.96, 99,567.78 and 40,321.12

Step by Step Solution

1. Step 1: Write the proportion equation
   72,151.96 : 99,567.78 = 40,321.12 : x
2. Step 2: Convert to fraction form
   72,151.96/99,567.78 = 40,321.12/x
3. Step 3: Cross multiply
   72,151.96x = 99,567.78 × 40,321.12
4. Step 4: Simplify right side
   72,151.96x = 4,014,684,405.51
5. Step 5: Solve for x
   x = 4,014,684,405.51/72,151.96
6. Step 6: Final answer
   x = 55,642.07