Finding the Fourth Proportional to 2,131.59, 2,942.01 and 1,247.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.59 : 2,942.01 = 1,247.48 : x
2. Step 2: Convert to fraction form
   2,131.59/2,942.01 = 1,247.48/x
3. Step 3: Cross multiply
   2,131.59x = 2,942.01 × 1,247.48
4. Step 4: Simplify right side
   2,131.59x = 3,670,083.92
5. Step 5: Solve for x
   x = 3,670,083.92/2,131.59
6. Step 6: Final answer
   x = 1,721.76