Finding the Fourth Proportional to 11,770.72, 17,609.52 and 9,117.28

Step by Step Solution

1. Step 1: Write the proportion equation
   11,770.72 : 17,609.52 = 9,117.28 : x
2. Step 2: Convert to fraction form
   11,770.72/17,609.52 = 9,117.28/x
3. Step 3: Cross multiply
   11,770.72x = 17,609.52 × 9,117.28
4. Step 4: Simplify right side
   11,770.72x = 160,550,924.51
5. Step 5: Solve for x
   x = 160,550,924.51/11,770.72
6. Step 6: Final answer
   x = 13,639.86