Finding the Fourth Proportional to 1,145.04, 1,580.25 and 647.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.04 : 1,580.25 = 647.79 : x
2. Step 2: Convert to fraction form
   1,145.04/1,580.25 = 647.79/x
3. Step 3: Cross multiply
   1,145.04x = 1,580.25 × 647.79
4. Step 4: Simplify right side
   1,145.04x = 1,023,670.15
5. Step 5: Solve for x
   x = 1,023,670.15/1,145.04
6. Step 6: Final answer
   x = 894.00