Finding the Fourth Proportional to 15,404.56, 21,259.74 and 9,117.88

Step by Step Solution

1. Step 1: Write the proportion equation
   15,404.56 : 21,259.74 = 9,117.88 : x
2. Step 2: Convert to fraction form
   15,404.56/21,259.74 = 9,117.88/x
3. Step 3: Cross multiply
   15,404.56x = 21,259.74 × 9,117.88
4. Step 4: Simplify right side
   15,404.56x = 193,843,758.15
5. Step 5: Solve for x
   x = 193,843,758.15/15,404.56
6. Step 6: Final answer
   x = 12,583.53