Finding the Fourth Proportional to 72,111.57, 99,510.71 and 40,274.25

Step by Step Solution

1. Step 1: Write the proportion equation
   72,111.57 : 99,510.71 = 40,274.25 : x
2. Step 2: Convert to fraction form
   72,111.57/99,510.71 = 40,274.25/x
3. Step 3: Cross multiply
   72,111.57x = 99,510.71 × 40,274.25
4. Step 4: Simplify right side
   72,111.57x = 4,007,719,010.85
5. Step 5: Solve for x
   x = 4,007,719,010.85/72,111.57
6. Step 6: Final answer
   x = 55,576.64