Finding the Fourth Proportional to 10,521.24, 15,784.61 and 3,947.55

Step by Step Solution

1. Step 1: Write the proportion equation
   10,521.24 : 15,784.61 = 3,947.55 : x
2. Step 2: Convert to fraction form
   10,521.24/15,784.61 = 3,947.55/x
3. Step 3: Cross multiply
   10,521.24x = 15,784.61 × 3,947.55
4. Step 4: Simplify right side
   10,521.24x = 62,310,517.47
5. Step 5: Solve for x
   x = 62,310,517.47/10,521.24
6. Step 6: Final answer
   x = 5,922.35