Finding the Fourth Proportional to 13,406.38, 18,501.01 and 7,438.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,406.38 : 18,501.01 = 7,438.30 : x
2. Step 2: Convert to fraction form
   13,406.38/18,501.01 = 7,438.30/x
3. Step 3: Cross multiply
   13,406.38x = 18,501.01 × 7,438.30
4. Step 4: Simplify right side
   13,406.38x = 137,615,997.83
5. Step 5: Solve for x
   x = 137,615,997.83/13,406.38
6. Step 6: Final answer
   x = 10,264.97