Finding the Fourth Proportional to 3,131.72, 4,700.40 and 1,672.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,131.72 : 4,700.40 = 1,672.12 : x
2. Step 2: Convert to fraction form
   3,131.72/4,700.40 = 1,672.12/x
3. Step 3: Cross multiply
   3,131.72x = 4,700.40 × 1,672.12
4. Step 4: Simplify right side
   3,131.72x = 7,859,632.85
5. Step 5: Solve for x
   x = 7,859,632.85/3,131.72
6. Step 6: Final answer
   x = 2,509.69