Finding the Fourth Proportional to 5,131.89, 7,085.80 and 3,145.16

Step by Step Solution

1. Step 1: Write the proportion equation
   5,131.89 : 7,085.80 = 3,145.16 : x
2. Step 2: Convert to fraction form
   5,131.89/7,085.80 = 3,145.16/x
3. Step 3: Cross multiply
   5,131.89x = 7,085.80 × 3,145.16
4. Step 4: Simplify right side
   5,131.89x = 22,285,974.73
5. Step 5: Solve for x
   x = 22,285,974.73/5,131.89
6. Step 6: Final answer
   x = 4,342.64