Finding the Fourth Proportional to 13,418.30, 18,516.32 and 7,449.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,418.30 : 18,516.32 = 7,449.50 : x
2. Step 2: Convert to fraction form
   13,418.30/18,516.32 = 7,449.50/x
3. Step 3: Cross multiply
   13,418.30x = 18,516.32 × 7,449.50
4. Step 4: Simplify right side
   13,418.30x = 137,937,196.01
5. Step 5: Solve for x
   x = 137,937,196.01/13,418.30
6. Step 6: Final answer
   x = 10,279.79