Finding the Fourth Proportional to 13,146.60, 18,142.59 and 7,178.52

Step by Step Solution

1. Step 1: Write the proportion equation
   13,146.60 : 18,142.59 = 7,178.52 : x
2. Step 2: Convert to fraction form
   13,146.60/18,142.59 = 7,178.52/x
3. Step 3: Cross multiply
   13,146.60x = 18,142.59 × 7,178.52
4. Step 4: Simplify right side
   13,146.60x = 130,236,945.17
5. Step 5: Solve for x
   x = 130,236,945.17/13,146.60
6. Step 6: Final answer
   x = 9,906.51