Finding the Fourth Proportional to 2,172.20, 3,259.98 and 874.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,172.20 : 3,259.98 = 874.76 : x
2. Step 2: Convert to fraction form
   2,172.20/3,259.98 = 874.76/x
3. Step 3: Cross multiply
   2,172.20x = 3,259.98 × 874.76
4. Step 4: Simplify right side
   2,172.20x = 2,851,700.10
5. Step 5: Solve for x
   x = 2,851,700.10/2,172.20
6. Step 6: Final answer
   x = 1,312.82