Finding the Fourth Proportional to 9,659.35, 13,354.67 and 7,428.61

Step by Step Solution

1. Step 1: Write the proportion equation
   9,659.35 : 13,354.67 = 7,428.61 : x
2. Step 2: Convert to fraction form
   9,659.35/13,354.67 = 7,428.61/x
3. Step 3: Cross multiply
   9,659.35x = 13,354.67 × 7,428.61
4. Step 4: Simplify right side
   9,659.35x = 99,206,670.37
5. Step 5: Solve for x
   x = 99,206,670.37/9,659.35
6. Step 6: Final answer
   x = 10,270.53