Finding the Fourth Proportional to 2,876.51, 3,967.98 and 1,980.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,876.51 : 3,967.98 = 1,980.15 : x
2. Step 2: Convert to fraction form
   2,876.51/3,967.98 = 1,980.15/x
3. Step 3: Cross multiply
   2,876.51x = 3,967.98 × 1,980.15
4. Step 4: Simplify right side
   2,876.51x = 7,857,195.60
5. Step 5: Solve for x
   x = 7,857,195.60/2,876.51
6. Step 6: Final answer
   x = 2,731.51