Finding the Fourth Proportional to 10,521.27, 15,780.24 and 3,506.18

Step by Step Solution

1. Step 1: Write the proportion equation
   10,521.27 : 15,780.24 = 3,506.18 : x
2. Step 2: Convert to fraction form
   10,521.27/15,780.24 = 3,506.18/x
3. Step 3: Cross multiply
   10,521.27x = 15,780.24 × 3,506.18
4. Step 4: Simplify right side
   10,521.27x = 55,328,282.98
5. Step 5: Solve for x
   x = 55,328,282.98/10,521.27
6. Step 6: Final answer
   x = 5,258.71