Finding the Fourth Proportional to 10,431.09, 14,388.89 and 7,238.66

Step by Step Solution

1. Step 1: Write the proportion equation
   10,431.09 : 14,388.89 = 7,238.66 : x
2. Step 2: Convert to fraction form
   10,431.09/14,388.89 = 7,238.66/x
3. Step 3: Cross multiply
   10,431.09x = 14,388.89 × 7,238.66
4. Step 4: Simplify right side
   10,431.09x = 104,156,174.35
5. Step 5: Solve for x
   x = 104,156,174.35/10,431.09
6. Step 6: Final answer
   x = 9,985.17