Finding the Fourth Proportional to 11,817.78, 17,717.86 and 5,153

Step by Step Solution

1. Step 1: Write the proportion equation
   11,817.78 : 17,717.86 = 5,153 : x
2. Step 2: Convert to fraction form
   11,817.78/17,717.86 = 5,153/x
3. Step 3: Cross multiply
   11,817.78x = 17,717.86 × 5,153
4. Step 4: Simplify right side
   11,817.78x = 91,300,132.58
5. Step 5: Solve for x
   x = 91,300,132.58/11,817.78
6. Step 6: Final answer
   x = 7,725.66