Finding the Fourth Proportional to 13,388.09, 18,473.47 and 7,723.05

Step by Step Solution

1. Step 1: Write the proportion equation
   13,388.09 : 18,473.47 = 7,723.05 : x
2. Step 2: Convert to fraction form
   13,388.09/18,473.47 = 7,723.05/x
3. Step 3: Cross multiply
   13,388.09x = 18,473.47 × 7,723.05
4. Step 4: Simplify right side
   13,388.09x = 142,671,443.90
5. Step 5: Solve for x
   x = 142,671,443.90/13,388.09
6. Step 6: Final answer
   x = 10,656.60