Finding the Fourth Proportional to 2,587.50, 3,572.20 and 1,980.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,587.50 : 3,572.20 = 1,980.69 : x
2. Step 2: Convert to fraction form
   2,587.50/3,572.20 = 1,980.69/x
3. Step 3: Cross multiply
   2,587.50x = 3,572.20 × 1,980.69
4. Step 4: Simplify right side
   2,587.50x = 7,075,424.80
5. Step 5: Solve for x
   x = 7,075,424.80/2,587.50
6. Step 6: Final answer
   x = 2,734.47