Finding the Fourth Proportional to 13,405.31, 18,499.94 and 7,436.61

Step by Step Solution

1. Step 1: Write the proportion equation
   13,405.31 : 18,499.94 = 7,436.61 : x
2. Step 2: Convert to fraction form
   13,405.31/18,499.94 = 7,436.61/x
3. Step 3: Cross multiply
   13,405.31x = 18,499.94 × 7,436.61
4. Step 4: Simplify right side
   13,405.31x = 137,576,801.62
5. Step 5: Solve for x
   x = 137,576,801.62/13,405.31
6. Step 6: Final answer
   x = 10,262.86