Finding the Fourth Proportional to 1,065.16, 1,470.02 and 645.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,065.16 : 1,470.02 = 645.61 : x
2. Step 2: Convert to fraction form
   1,065.16/1,470.02 = 645.61/x
3. Step 3: Cross multiply
   1,065.16x = 1,470.02 × 645.61
4. Step 4: Simplify right side
   1,065.16x = 949,059.61
5. Step 5: Solve for x
   x = 949,059.61/1,065.16
6. Step 6: Final answer
   x = 891.00