Finding the Fourth Proportional to 15,357.24, 21,186.72 and 9,690.06

Step by Step Solution

1. Step 1: Write the proportion equation
   15,357.24 : 21,186.72 = 9,690.06 : x
2. Step 2: Convert to fraction form
   15,357.24/21,186.72 = 9,690.06/x
3. Step 3: Cross multiply
   15,357.24x = 21,186.72 × 9,690.06
4. Step 4: Simplify right side
   15,357.24x = 205,300,588.00
5. Step 5: Solve for x
   x = 205,300,588.00/15,357.24
6. Step 6: Final answer
   x = 13,368.33