Finding the Fourth Proportional to 7,131.15, 9,840.72 and 3,987.27

Step by Step Solution

1. Step 1: Write the proportion equation
   7,131.15 : 9,840.72 = 3,987.27 : x
2. Step 2: Convert to fraction form
   7,131.15/9,840.72 = 3,987.27/x
3. Step 3: Cross multiply
   7,131.15x = 9,840.72 × 3,987.27
4. Step 4: Simplify right side
   7,131.15x = 39,237,607.63
5. Step 5: Solve for x
   x = 39,237,607.63/7,131.15
6. Step 6: Final answer
   x = 5,502.28