Finding the Fourth Proportional to 13,157.88, 19,567.59 and 12,742.59

Step by Step Solution

1. Step 1: Write the proportion equation
   13,157.88 : 19,567.59 = 12,742.59 : x
2. Step 2: Convert to fraction form
   13,157.88/19,567.59 = 12,742.59/x
3. Step 3: Cross multiply
   13,157.88x = 19,567.59 × 12,742.59
4. Step 4: Simplify right side
   13,157.88x = 249,341,751.06
5. Step 5: Solve for x
   x = 249,341,751.06/13,157.88
6. Step 6: Final answer
   x = 18,949.99