Finding the Fourth Proportional to 3,988.29, 5,970.15 and 3,648.09

Step by Step Solution

1. Step 1: Write the proportion equation
   3,988.29 : 5,970.15 = 3,648.09 : x
2. Step 2: Convert to fraction form
   3,988.29/5,970.15 = 3,648.09/x
3. Step 3: Cross multiply
   3,988.29x = 5,970.15 × 3,648.09
4. Step 4: Simplify right side
   3,988.29x = 21,779,644.51
5. Step 5: Solve for x
   x = 21,779,644.51/3,988.29
6. Step 6: Final answer
   x = 5,460.90