Finding the Fourth Proportional to 2,141.80, 2,956.20 and 1,345.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,141.80 : 2,956.20 = 1,345.60 : x
2. Step 2: Convert to fraction form
   2,141.80/2,956.20 = 1,345.60/x
3. Step 3: Cross multiply
   2,141.80x = 2,956.20 × 1,345.60
4. Step 4: Simplify right side
   2,141.80x = 3,977,862.72
5. Step 5: Solve for x
   x = 3,977,862.72/2,141.80
6. Step 6: Final answer
   x = 1,857.25