Finding the Fourth Proportional to 2,160.42, 2,980.60 and 1,276.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,160.42 : 2,980.60 = 1,276.03 : x
2. Step 2: Convert to fraction form
   2,160.42/2,980.60 = 1,276.03/x
3. Step 3: Cross multiply
   2,160.42x = 2,980.60 × 1,276.03
4. Step 4: Simplify right side
   2,160.42x = 3,803,335.02
5. Step 5: Solve for x
   x = 3,803,335.02/2,160.42
6. Step 6: Final answer
   x = 1,760.46