Finding the Fourth Proportional to 15,243.85, 21,034.84 and 8,870.56

Step by Step Solution

1. Step 1: Write the proportion equation
   15,243.85 : 21,034.84 = 8,870.56 : x
2. Step 2: Convert to fraction form
   15,243.85/21,034.84 = 8,870.56/x
3. Step 3: Cross multiply
   15,243.85x = 21,034.84 × 8,870.56
4. Step 4: Simplify right side
   15,243.85x = 186,590,870.50
5. Step 5: Solve for x
   x = 186,590,870.50/15,243.85
6. Step 6: Final answer
   x = 12,240.41