Finding the Fourth Proportional to 72,271.10, 99,731.61 and 40,007.12

Step by Step Solution

1. Step 1: Write the proportion equation
   72,271.10 : 99,731.61 = 40,007.12 : x
2. Step 2: Convert to fraction form
   72,271.10/99,731.61 = 40,007.12/x
3. Step 3: Cross multiply
   72,271.10x = 99,731.61 × 40,007.12
4. Step 4: Simplify right side
   72,271.10x = 3,989,974,489.06
5. Step 5: Solve for x
   x = 3,989,974,489.06/72,271.10
6. Step 6: Final answer
   x = 55,208.44