Finding the Fourth Proportional to 13,405.21, 18,499.07 and 7,355.34

Step by Step Solution

1. Step 1: Write the proportion equation
   13,405.21 : 18,499.07 = 7,355.34 : x
2. Step 2: Convert to fraction form
   13,405.21/18,499.07 = 7,355.34/x
3. Step 3: Cross multiply
   13,405.21x = 18,499.07 × 7,355.34
4. Step 4: Simplify right side
   13,405.21x = 136,066,967.92
5. Step 5: Solve for x
   x = 136,066,967.92/13,405.21
6. Step 6: Final answer
   x = 10,150.31