Finding the Fourth Proportional to 13,406.18, 18,500.64 and 7,438.24

Step by Step Solution

1. Step 1: Write the proportion equation
   13,406.18 : 18,500.64 = 7,438.24 : x
2. Step 2: Convert to fraction form
   13,406.18/18,500.64 = 7,438.24/x
3. Step 3: Cross multiply
   13,406.18x = 18,500.64 × 7,438.24
4. Step 4: Simplify right side
   13,406.18x = 137,612,200.47
5. Step 5: Solve for x
   x = 137,612,200.47/13,406.18
6. Step 6: Final answer
   x = 10,264.83