Finding the Fourth Proportional to 13,405.21, 18,498.37 and 7,355.32

Step by Step Solution

1. Step 1: Write the proportion equation
   13,405.21 : 18,498.37 = 7,355.32 : x
2. Step 2: Convert to fraction form
   13,405.21/18,498.37 = 7,355.32/x
3. Step 3: Cross multiply
   13,405.21x = 18,498.37 × 7,355.32
4. Step 4: Simplify right side
   13,405.21x = 136,061,301.56
5. Step 5: Solve for x
   x = 136,061,301.56/13,405.21
6. Step 6: Final answer
   x = 10,149.89