Finding the Fourth Proportional to 6,441.31, 8,906.90 and 5,112.71

Step by Step Solution

1. Step 1: Write the proportion equation
   6,441.31 : 8,906.90 = 5,112.71 : x
2. Step 2: Convert to fraction form
   6,441.31/8,906.90 = 5,112.71/x
3. Step 3: Cross multiply
   6,441.31x = 8,906.90 × 5,112.71
4. Step 4: Simplify right side
   6,441.31x = 45,538,364.95
5. Step 5: Solve for x
   x = 45,538,364.95/6,441.31
6. Step 6: Final answer
   x = 7,069.74