Finding the Fourth Proportional to 72,038.48, 99,414.60 and 40,208.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72,038.48 : 99,414.60 = 40,208.72 : x
2. Step 2: Convert to fraction form
   72,038.48/99,414.60 = 40,208.72/x
3. Step 3: Cross multiply
   72,038.48x = 99,414.60 × 40,208.72
4. Step 4: Simplify right side
   72,038.48x = 3,997,333,815.31
5. Step 5: Solve for x
   x = 3,997,333,815.31/72,038.48
6. Step 6: Final answer
   x = 55,488.87