Finding the Fourth Proportional to 12,889.82, 17,789.20 and 7,225.53

Step by Step Solution

1. Step 1: Write the proportion equation
   12,889.82 : 17,789.20 = 7,225.53 : x
2. Step 2: Convert to fraction form
   12,889.82/17,789.20 = 7,225.53/x
3. Step 3: Cross multiply
   12,889.82x = 17,789.20 × 7,225.53
4. Step 4: Simplify right side
   12,889.82x = 128,536,398.28
5. Step 5: Solve for x
   x = 128,536,398.28/12,889.82
6. Step 6: Final answer
   x = 9,971.93