Finding the Fourth Proportional to 7,131.42, 9,841.38 and 3,987.60

Step by Step Solution

1. Step 1: Write the proportion equation
   7,131.42 : 9,841.38 = 3,987.60 : x
2. Step 2: Convert to fraction form
   7,131.42/9,841.38 = 3,987.60/x
3. Step 3: Cross multiply
   7,131.42x = 9,841.38 × 3,987.60
4. Step 4: Simplify right side
   7,131.42x = 39,243,486.89
5. Step 5: Solve for x
   x = 39,243,486.89/7,131.42
6. Step 6: Final answer
   x = 5,502.90