Finding the Fourth Proportional to 1,064.82, 1,469.41 and 645.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,064.82 : 1,469.41 = 645.10 : x
2. Step 2: Convert to fraction form
   1,064.82/1,469.41 = 645.10/x
3. Step 3: Cross multiply
   1,064.82x = 1,469.41 × 645.10
4. Step 4: Simplify right side
   1,064.82x = 947,916.39
5. Step 5: Solve for x
   x = 947,916.39/1,064.82
6. Step 6: Final answer
   x = 890.21