Finding the Fourth Proportional to 1,145.36, 1,580.22 and 647.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.36 : 1,580.22 = 647.82 : x
2. Step 2: Convert to fraction form
   1,145.36/1,580.22 = 647.82/x
3. Step 3: Cross multiply
   1,145.36x = 1,580.22 × 647.82
4. Step 4: Simplify right side
   1,145.36x = 1,023,698.12
5. Step 5: Solve for x
   x = 1,023,698.12/1,145.36
6. Step 6: Final answer
   x = 893.78