Finding the Fourth Proportional to 2,159.06, 2,980.70 and 2,011.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,159.06 : 2,980.70 = 2,011.43 : x
2. Step 2: Convert to fraction form
   2,159.06/2,980.70 = 2,011.43/x
3. Step 3: Cross multiply
   2,159.06x = 2,980.70 × 2,011.43
4. Step 4: Simplify right side
   2,159.06x = 5,995,474.34
5. Step 5: Solve for x
   x = 5,995,474.34/2,159.06
6. Step 6: Final answer
   x = 2,776.90