Finding the Fourth Proportional to 2,131.58, 2,941.71 and 1,247.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.58 : 2,941.71 = 1,247.60 : x
2. Step 2: Convert to fraction form
   2,131.58/2,941.71 = 1,247.60/x
3. Step 3: Cross multiply
   2,131.58x = 2,941.71 × 1,247.60
4. Step 4: Simplify right side
   2,131.58x = 3,670,077.40
5. Step 5: Solve for x
   x = 3,670,077.40/2,131.58
6. Step 6: Final answer
   x = 1,721.76