Finding the Fourth Proportional to 72,419.06, 99,928.68 and 40,588.49

Step by Step Solution

1. Step 1: Write the proportion equation
   72,419.06 : 99,928.68 = 40,588.49 : x
2. Step 2: Convert to fraction form
   72,419.06/99,928.68 = 40,588.49/x
3. Step 3: Cross multiply
   72,419.06x = 99,928.68 × 40,588.49
4. Step 4: Simplify right side
   72,419.06x = 4,055,954,228.89
5. Step 5: Solve for x
   x = 4,055,954,228.89/72,419.06
6. Step 6: Final answer
   x = 56,006.72