Finding the Fourth Proportional to 12,328.64, 17,012.80 and 7,022.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,328.64 : 17,012.80 = 7,022.72 : x
2. Step 2: Convert to fraction form
   12,328.64/17,012.80 = 7,022.72/x
3. Step 3: Cross multiply
   12,328.64x = 17,012.80 × 7,022.72
4. Step 4: Simplify right side
   12,328.64x = 119,476,130.82
5. Step 5: Solve for x
   x = 119,476,130.82/12,328.64
6. Step 6: Final answer
   x = 9,690.94