Finding the Fourth Proportional to 1,064.93, 1,469.27 and 645.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,064.93 : 1,469.27 = 645.15 : x
2. Step 2: Convert to fraction form
   1,064.93/1,469.27 = 645.15/x
3. Step 3: Cross multiply
   1,064.93x = 1,469.27 × 645.15
4. Step 4: Simplify right side
   1,064.93x = 947,896.31
5. Step 5: Solve for x
   x = 947,896.31/1,064.93
6. Step 6: Final answer
   x = 890.11