Finding the Fourth Proportional to 9,050.12, 12,489.05 and 5,071.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,050.12 : 12,489.05 = 5,071.31 : x
2. Step 2: Convert to fraction form
   9,050.12/12,489.05 = 5,071.31/x
3. Step 3: Cross multiply
   9,050.12x = 12,489.05 × 5,071.31
4. Step 4: Simplify right side
   9,050.12x = 63,335,818.80
5. Step 5: Solve for x
   x = 63,335,818.80/9,050.12
6. Step 6: Final answer
   x = 6,998.34