Finding the Fourth Proportional to 12,780.28, 17,635.53 and 7,474.06

Step by Step Solution

1. Step 1: Write the proportion equation
   12,780.28 : 17,635.53 = 7,474.06 : x
2. Step 2: Convert to fraction form
   12,780.28/17,635.53 = 7,474.06/x
3. Step 3: Cross multiply
   12,780.28x = 17,635.53 × 7,474.06
4. Step 4: Simplify right side
   12,780.28x = 131,809,009.35
5. Step 5: Solve for x
   x = 131,809,009.35/12,780.28
6. Step 6: Final answer
   x = 10,313.47