Finding the Fourth Proportional to 13,066.64, 18,031.71 and 7,401.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,066.64 : 18,031.71 = 7,401.31 : x
2. Step 2: Convert to fraction form
   13,066.64/18,031.71 = 7,401.31/x
3. Step 3: Cross multiply
   13,066.64x = 18,031.71 × 7,401.31
4. Step 4: Simplify right side
   13,066.64x = 133,458,275.54
5. Step 5: Solve for x
   x = 133,458,275.54/13,066.64
6. Step 6: Final answer
   x = 10,213.66