Finding the Fourth Proportional to 13,157.88, 18,158.59 and 7,494.40

Step by Step Solution

1. Step 1: Write the proportion equation
   13,157.88 : 18,158.59 = 7,494.40 : x
2. Step 2: Convert to fraction form
   13,157.88/18,158.59 = 7,494.40/x
3. Step 3: Cross multiply
   13,157.88x = 18,158.59 × 7,494.40
4. Step 4: Simplify right side
   13,157.88x = 136,087,843.34
5. Step 5: Solve for x
   x = 136,087,843.34/13,157.88
6. Step 6: Final answer
   x = 10,342.69