Finding the Fourth Proportional to 2,875.89, 3,969.96 and 1,980.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,875.89 : 3,969.96 = 1,980.89 : x
2. Step 2: Convert to fraction form
   2,875.89/3,969.96 = 1,980.89/x
3. Step 3: Cross multiply
   2,875.89x = 3,969.96 × 1,980.89
4. Step 4: Simplify right side
   2,875.89x = 7,864,034.21
5. Step 5: Solve for x
   x = 7,864,034.21/2,875.89
6. Step 6: Final answer
   x = 2,734.47