Finding the Fourth Proportional to 1,419.08, 2,129.04 and 688.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.08 : 2,129.04 = 688.72 : x
2. Step 2: Convert to fraction form
   1,419.08/2,129.04 = 688.72/x
3. Step 3: Cross multiply
   1,419.08x = 2,129.04 × 688.72
4. Step 4: Simplify right side
   1,419.08x = 1,466,312.43
5. Step 5: Solve for x
   x = 1,466,312.43/1,419.08
6. Step 6: Final answer
   x = 1,033.28