Finding the Fourth Proportional to 13,540.23, 18,685.59 and 7,572.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,540.23 : 18,685.59 = 7,572.15 : x
2. Step 2: Convert to fraction form
   13,540.23/18,685.59 = 7,572.15/x
3. Step 3: Cross multiply
   13,540.23x = 18,685.59 × 7,572.15
4. Step 4: Simplify right side
   13,540.23x = 141,490,090.32
5. Step 5: Solve for x
   x = 141,490,090.32/13,540.23
6. Step 6: Final answer
   x = 10,449.61