Finding the Fourth Proportional to 7,904.17, 10,912.89 and 5,072.61

Step by Step Solution

1. Step 1: Write the proportion equation
   7,904.17 : 10,912.89 = 5,072.61 : x
2. Step 2: Convert to fraction form
   7,904.17/10,912.89 = 5,072.61/x
3. Step 3: Cross multiply
   7,904.17x = 10,912.89 × 5,072.61
4. Step 4: Simplify right side
   7,904.17x = 55,356,834.94
5. Step 5: Solve for x
   x = 55,356,834.94/7,904.17
6. Step 6: Final answer
   x = 7,003.50