Finding the Fourth Proportional to 2,142.55, 2,955.78 and 1,396.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.55 : 2,955.78 = 1,396.63 : x
2. Step 2: Convert to fraction form
   2,142.55/2,955.78 = 1,396.63/x
3. Step 3: Cross multiply
   2,142.55x = 2,955.78 × 1,396.63
4. Step 4: Simplify right side
   2,142.55x = 4,128,131.02
5. Step 5: Solve for x
   x = 4,128,131.02/2,142.55
6. Step 6: Final answer
   x = 1,926.74