Finding the Fourth Proportional to 31,280.28, 46,920.72 and 7,906.71

Step by Step Solution

1. Step 1: Write the proportion equation
   31,280.28 : 46,920.72 = 7,906.71 : x
2. Step 2: Convert to fraction form
   31,280.28/46,920.72 = 7,906.71/x
3. Step 3: Cross multiply
   31,280.28x = 46,920.72 × 7,906.71
4. Step 4: Simplify right side
   31,280.28x = 370,988,526.03
5. Step 5: Solve for x
   x = 370,988,526.03/31,280.28
6. Step 6: Final answer
   x = 11,860.14