Finding the Fourth Proportional to 1,145.02, 1,580.25 and 647.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.02 : 1,580.25 = 647.77 : x
2. Step 2: Convert to fraction form
   1,145.02/1,580.25 = 647.77/x
3. Step 3: Cross multiply
   1,145.02x = 1,580.25 × 647.77
4. Step 4: Simplify right side
   1,145.02x = 1,023,638.54
5. Step 5: Solve for x
   x = 1,023,638.54/1,145.02
6. Step 6: Final answer
   x = 893.99