Finding the Fourth Proportional to 2,776.82, 3,830.10 and 1,980.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,776.82 : 3,830.10 = 1,980.05 : x
2. Step 2: Convert to fraction form
   2,776.82/3,830.10 = 1,980.05/x
3. Step 3: Cross multiply
   2,776.82x = 3,830.10 × 1,980.05
4. Step 4: Simplify right side
   2,776.82x = 7,583,789.51
5. Step 5: Solve for x
   x = 7,583,789.51/2,776.82
6. Step 6: Final answer
   x = 2,731.11