Finding the Fourth Proportional to 10,985.20, 16,479.72 and 3,587.60

Step by Step Solution

1. Step 1: Write the proportion equation
   10,985.20 : 16,479.72 = 3,587.60 : x
2. Step 2: Convert to fraction form
   10,985.20/16,479.72 = 3,587.60/x
3. Step 3: Cross multiply
   10,985.20x = 16,479.72 × 3,587.60
4. Step 4: Simplify right side
   10,985.20x = 59,122,643.47
5. Step 5: Solve for x
   x = 59,122,643.47/10,985.20
6. Step 6: Final answer
   x = 5,382.03