Finding the Fourth Proportional to 5,085.60, 7,621.72 and 3,684.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,085.60 : 7,621.72 = 3,684.72 : x
2. Step 2: Convert to fraction form
   5,085.60/7,621.72 = 3,684.72/x
3. Step 3: Cross multiply
   5,085.60x = 7,621.72 × 3,684.72
4. Step 4: Simplify right side
   5,085.60x = 28,083,904.12
5. Step 5: Solve for x
   x = 28,083,904.12/5,085.60
6. Step 6: Final answer
   x = 5,522.24