Finding the Fourth Proportional to 13,758.18, 18,986.40 and 7,470.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,758.18 : 18,986.40 = 7,470.56 : x
2. Step 2: Convert to fraction form
   13,758.18/18,986.40 = 7,470.56/x
3. Step 3: Cross multiply
   13,758.18x = 18,986.40 × 7,470.56
4. Step 4: Simplify right side
   13,758.18x = 141,839,040.38
5. Step 5: Solve for x
   x = 141,839,040.38/13,758.18
6. Step 6: Final answer
   x = 10,309.43