Finding the Fourth Proportional to 72,403.60, 99,920.96 and 40,582.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72,403.60 : 99,920.96 = 40,582.72 : x
2. Step 2: Convert to fraction form
   72,403.60/99,920.96 = 40,582.72/x
3. Step 3: Cross multiply
   72,403.60x = 99,920.96 × 40,582.72
4. Step 4: Simplify right side
   72,403.60x = 4,055,064,341.81
5. Step 5: Solve for x
   x = 4,055,064,341.81/72,403.60
6. Step 6: Final answer
   x = 56,006.39