Finding the Fourth Proportional to 13,405.50, 18,499.61 and 7,817.58

Step by Step Solution

1. Step 1: Write the proportion equation
   13,405.50 : 18,499.61 = 7,817.58 : x
2. Step 2: Convert to fraction form
   13,405.50/18,499.61 = 7,817.58/x
3. Step 3: Cross multiply
   13,405.50x = 18,499.61 × 7,817.58
4. Step 4: Simplify right side
   13,405.50x = 144,622,142.06
5. Step 5: Solve for x
   x = 144,622,142.06/13,405.50
6. Step 6: Final answer
   x = 10,788.27