Finding the Fourth Proportional to 3,990.93, 5,506.59 and 2,479.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,990.93 : 5,506.59 = 2,479.72 : x
2. Step 2: Convert to fraction form
   3,990.93/5,506.59 = 2,479.72/x
3. Step 3: Cross multiply
   3,990.93x = 5,506.59 × 2,479.72
4. Step 4: Simplify right side
   3,990.93x = 13,654,801.35
5. Step 5: Solve for x
   x = 13,654,801.35/3,990.93
6. Step 6: Final answer
   x = 3,421.46