Finding the Fourth Proportional to 7,964.09, 10,987.39 and 5,131.25

Step by Step Solution

1. Step 1: Write the proportion equation
   7,964.09 : 10,987.39 = 5,131.25 : x
2. Step 2: Convert to fraction form
   7,964.09/10,987.39 = 5,131.25/x
3. Step 3: Cross multiply
   7,964.09x = 10,987.39 × 5,131.25
4. Step 4: Simplify right side
   7,964.09x = 56,378,977.17
5. Step 5: Solve for x
   x = 56,378,977.17/7,964.09
6. Step 6: Final answer
   x = 7,079.15