Finding the Fourth Proportional to 12,742.60, 17,588.82 and 7,439.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,742.60 : 17,588.82 = 7,439.56 : x
2. Step 2: Convert to fraction form
   12,742.60/17,588.82 = 7,439.56/x
3. Step 3: Cross multiply
   12,742.60x = 17,588.82 × 7,439.56
4. Step 4: Simplify right side
   12,742.60x = 130,853,081.72
5. Step 5: Solve for x
   x = 130,853,081.72/12,742.60
6. Step 6: Final answer
   x = 10,268.95