Finding the Fourth Proportional to 1,647.18, 2,270.89 and 1,056.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,647.18 : 2,270.89 = 1,056.69 : x
2. Step 2: Convert to fraction form
   1,647.18/2,270.89 = 1,056.69/x
3. Step 3: Cross multiply
   1,647.18x = 2,270.89 × 1,056.69
4. Step 4: Simplify right side
   1,647.18x = 2,399,621.47
5. Step 5: Solve for x
   x = 2,399,621.47/1,647.18
6. Step 6: Final answer
   x = 1,456.81