Finding the Fourth Proportional to 13,426.37, 18,528.16 and 7,457.89

Step by Step Solution

1. Step 1: Write the proportion equation
   13,426.37 : 18,528.16 = 7,457.89 : x
2. Step 2: Convert to fraction form
   13,426.37/18,528.16 = 7,457.89/x
3. Step 3: Cross multiply
   13,426.37x = 18,528.16 × 7,457.89
4. Step 4: Simplify right side
   13,426.37x = 138,180,914.22
5. Step 5: Solve for x
   x = 138,180,914.22/13,426.37
6. Step 6: Final answer
   x = 10,291.75