Finding the Fourth Proportional to 7,131.02, 9,840.83 and 3,987.21

Step by Step Solution

1. Step 1: Write the proportion equation
   7,131.02 : 9,840.83 = 3,987.21 : x
2. Step 2: Convert to fraction form
   7,131.02/9,840.83 = 3,987.21/x
3. Step 3: Cross multiply
   7,131.02x = 9,840.83 × 3,987.21
4. Step 4: Simplify right side
   7,131.02x = 39,237,416.55
5. Step 5: Solve for x
   x = 39,237,416.55/7,131.02
6. Step 6: Final answer
   x = 5,502.36