Finding the Fourth Proportional to 9,320.06, 12,861.69 and 5,128.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,320.06 : 12,861.69 = 5,128.31 : x
2. Step 2: Convert to fraction form
   9,320.06/12,861.69 = 5,128.31/x
3. Step 3: Cross multiply
   9,320.06x = 12,861.69 × 5,128.31
4. Step 4: Simplify right side
   9,320.06x = 65,958,746.37
5. Step 5: Solve for x
   x = 65,958,746.37/9,320.06
6. Step 6: Final answer
   x = 7,077.07