Finding the Fourth Proportional to 2,131.67, 2,942.15 and 1,247.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.67 : 2,942.15 = 1,247.69 : x
2. Step 2: Convert to fraction form
   2,131.67/2,942.15 = 1,247.69/x
3. Step 3: Cross multiply
   2,131.67x = 2,942.15 × 1,247.69
4. Step 4: Simplify right side
   2,131.67x = 3,670,892.25
5. Step 5: Solve for x
   x = 3,670,892.25/2,131.67
6. Step 6: Final answer
   x = 1,722.07