Finding the Fourth Proportional to 1,065.49, 1,470.42 and 645.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,065.49 : 1,470.42 = 645.71 : x
2. Step 2: Convert to fraction form
   1,065.49/1,470.42 = 645.71/x
3. Step 3: Cross multiply
   1,065.49x = 1,470.42 × 645.71
4. Step 4: Simplify right side
   1,065.49x = 949,457.55
5. Step 5: Solve for x
   x = 949,457.55/1,065.49
6. Step 6: Final answer
   x = 891.10