Finding the Fourth Proportional to 1,421.01, 2,128.68 and 874.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.01 : 2,128.68 = 874.26 : x
2. Step 2: Convert to fraction form
   1,421.01/2,128.68 = 874.26/x
3. Step 3: Cross multiply
   1,421.01x = 2,128.68 × 874.26
4. Step 4: Simplify right side
   1,421.01x = 1,861,019.78
5. Step 5: Solve for x
   x = 1,861,019.78/1,421.01
6. Step 6: Final answer
   x = 1,309.65