Finding the Fourth Proportional to 9,320, 12,861.69 and 5,128.34

Step by Step Solution

1. Step 1: Write the proportion equation
   9,320 : 12,861.69 = 5,128.34 : x
2. Step 2: Convert to fraction form
   9,320/12,861.69 = 5,128.34/x
3. Step 3: Cross multiply
   9,320x = 12,861.69 × 5,128.34
4. Step 4: Simplify right side
   9,320x = 65,959,119.29
5. Step 5: Solve for x
   x = 65,959,119.29/9,320
6. Step 6: Final answer
   x = 7,077.16