Finding the Fourth Proportional to 1,419.39, 2,129.76 and 871.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.39 : 2,129.76 = 871.29 : x
2. Step 2: Convert to fraction form
   1,419.39/2,129.76 = 871.29/x
3. Step 3: Cross multiply
   1,419.39x = 2,129.76 × 871.29
4. Step 4: Simplify right side
   1,419.39x = 1,855,638.59
5. Step 5: Solve for x
   x = 1,855,638.59/1,419.39
6. Step 6: Final answer
   x = 1,307.35