Finding the Fourth Proportional to 72,198.63, 99,637.28 and 40,367.55

Step by Step Solution

1. Step 1: Write the proportion equation
   72,198.63 : 99,637.28 = 40,367.55 : x
2. Step 2: Convert to fraction form
   72,198.63/99,637.28 = 40,367.55/x
3. Step 3: Cross multiply
   72,198.63x = 99,637.28 × 40,367.55
4. Step 4: Simplify right side
   72,198.63x = 4,022,112,680.43
5. Step 5: Solve for x
   x = 4,022,112,680.43/72,198.63
6. Step 6: Final answer
   x = 55,708.99