Finding the Fourth Proportional to 72,042.28, 99,409.16 and 40,212.52

Step by Step Solution

1. Step 1: Write the proportion equation
   72,042.28 : 99,409.16 = 40,212.52 : x
2. Step 2: Convert to fraction form
   72,042.28/99,409.16 = 40,212.52/x
3. Step 3: Cross multiply
   72,042.28x = 99,409.16 × 40,212.52
4. Step 4: Simplify right side
   72,042.28x = 3,997,492,686.69
5. Step 5: Solve for x
   x = 3,997,492,686.69/72,042.28
6. Step 6: Final answer
   x = 55,488.15