Finding the Fourth Proportional to 9,644.79, 13,317.69 and 7,129.74

Step by Step Solution

1. Step 1: Write the proportion equation
   9,644.79 : 13,317.69 = 7,129.74 : x
2. Step 2: Convert to fraction form
   9,644.79/13,317.69 = 7,129.74/x
3. Step 3: Cross multiply
   9,644.79x = 13,317.69 × 7,129.74
4. Step 4: Simplify right side
   9,644.79x = 94,951,667.10
5. Step 5: Solve for x
   x = 94,951,667.10/9,644.79
6. Step 6: Final answer
   x = 9,844.87