Finding the Fourth Proportional to 15,290.35, 21,100.90 and 9,239.76

Step by Step Solution

1. Step 1: Write the proportion equation
   15,290.35 : 21,100.90 = 9,239.76 : x
2. Step 2: Convert to fraction form
   15,290.35/21,100.90 = 9,239.76/x
3. Step 3: Cross multiply
   15,290.35x = 21,100.90 × 9,239.76
4. Step 4: Simplify right side
   15,290.35x = 194,967,205.59
5. Step 5: Solve for x
   x = 194,967,205.59/15,290.35
6. Step 6: Final answer
   x = 12,751.00