Finding the Fourth Proportional to 13,405.87, 18,499.89 and 7,356.16

Step by Step Solution

1. Step 1: Write the proportion equation
   13,405.87 : 18,499.89 = 7,356.16 : x
2. Step 2: Convert to fraction form
   13,405.87/18,499.89 = 7,356.16/x
3. Step 3: Cross multiply
   13,405.87x = 18,499.89 × 7,356.16
4. Step 4: Simplify right side
   13,405.87x = 136,088,150.82
5. Step 5: Solve for x
   x = 136,088,150.82/13,405.87
6. Step 6: Final answer
   x = 10,151.39