Finding the Fourth Proportional to 72,415.05, 99,938.66 and 40,152.86

Step by Step Solution

1. Step 1: Write the proportion equation
   72,415.05 : 99,938.66 = 40,152.86 : x
2. Step 2: Convert to fraction form
   72,415.05/99,938.66 = 40,152.86/x
3. Step 3: Cross multiply
   72,415.05x = 99,938.66 × 40,152.86
4. Step 4: Simplify right side
   72,415.05x = 4,012,823,485.89
5. Step 5: Solve for x
   x = 4,012,823,485.89/72,415.05
6. Step 6: Final answer
   x = 55,414.22