Finding the Fourth Proportional to 1,065.79, 1,470.67 and 646.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,065.79 : 1,470.67 = 646.25 : x
2. Step 2: Convert to fraction form
   1,065.79/1,470.67 = 646.25/x
3. Step 3: Cross multiply
   1,065.79x = 1,470.67 × 646.25
4. Step 4: Simplify right side
   1,065.79x = 950,415.15
5. Step 5: Solve for x
   x = 950,415.15/1,065.79
6. Step 6: Final answer
   x = 891.75