Finding the Fourth Proportional to 2,131.52, 2,940.47 and 1,385.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.52 : 2,940.47 = 1,385.71 : x
2. Step 2: Convert to fraction form
   2,131.52/2,940.47 = 1,385.71/x
3. Step 3: Cross multiply
   2,131.52x = 2,940.47 × 1,385.71
4. Step 4: Simplify right side
   2,131.52x = 4,074,629.60
5. Step 5: Solve for x
   x = 4,074,629.60/2,131.52
6. Step 6: Final answer
   x = 1,911.61