Finding the Fourth Proportional to 1,298,408.78, 1,791,896.89 and 717,619.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,298,408.78 : 1,791,896.89 = 717,619.42 : x
2. Step 2: Convert to fraction form
   1,298,408.78/1,791,896.89 = 717,619.42/x
3. Step 3: Cross multiply
   1,298,408.78x = 1,791,896.89 × 717,619.42
4. Step 4: Simplify right side
   1,298,408.78x = 1,285,900,005,168.49
5. Step 5: Solve for x
   x = 1,285,900,005,168.49/1,298,408.78
6. Step 6: Final answer
   x = 990,366.07