Finding the Fourth Proportional to 12,742.38, 17,585.91 and 7,438.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,742.38 : 17,585.91 = 7,438.50 : x
2. Step 2: Convert to fraction form
   12,742.38/17,585.91 = 7,438.50/x
3. Step 3: Cross multiply
   12,742.38x = 17,585.91 × 7,438.50
4. Step 4: Simplify right side
   12,742.38x = 130,812,791.54
5. Step 5: Solve for x
   x = 130,812,791.54/12,742.38
6. Step 6: Final answer
   x = 10,265.96