Finding the Fourth Proportional to 13,405.29, 18,498.43 and 7,436.55

Step by Step Solution

1. Step 1: Write the proportion equation
   13,405.29 : 18,498.43 = 7,436.55 : x
2. Step 2: Convert to fraction form
   13,405.29/18,498.43 = 7,436.55/x
3. Step 3: Cross multiply
   13,405.29x = 18,498.43 × 7,436.55
4. Step 4: Simplify right side
   13,405.29x = 137,564,499.62
5. Step 5: Solve for x
   x = 137,564,499.62/13,405.29
6. Step 6: Final answer
   x = 10,261.96