Finding the Fourth Proportional to 72,157.56, 99,568.81 and 39,887.83

Step by Step Solution

1. Step 1: Write the proportion equation
   72,157.56 : 99,568.81 = 39,887.83 : x
2. Step 2: Convert to fraction form
   72,157.56/99,568.81 = 39,887.83/x
3. Step 3: Cross multiply
   72,157.56x = 99,568.81 × 39,887.83
4. Step 4: Simplify right side
   72,157.56x = 3,971,583,632.61
5. Step 5: Solve for x
   x = 3,971,583,632.61/72,157.56
6. Step 6: Final answer
   x = 55,040.44