Finding the Fourth Proportional to 13,426.99, 18,528.30 and 7,458.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,426.99 : 18,528.30 = 7,458.30 : x
2. Step 2: Convert to fraction form
   13,426.99/18,528.30 = 7,458.30/x
3. Step 3: Cross multiply
   13,426.99x = 18,528.30 × 7,458.30
4. Step 4: Simplify right side
   13,426.99x = 138,189,619.89
5. Step 5: Solve for x
   x = 138,189,619.89/13,426.99
6. Step 6: Final answer
   x = 10,291.93