Finding the Fourth Proportional to 9,110.72, 12,570.28 and 5,131.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,110.72 : 12,570.28 = 5,131.60 : x
2. Step 2: Convert to fraction form
   9,110.72/12,570.28 = 5,131.60/x
3. Step 3: Cross multiply
   9,110.72x = 12,570.28 × 5,131.60
4. Step 4: Simplify right side
   9,110.72x = 64,505,648.85
5. Step 5: Solve for x
   x = 64,505,648.85/9,110.72
6. Step 6: Final answer
   x = 7,080.19