Finding the Fourth Proportional to 1,145.19, 1,580.59 and 647.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.19 : 1,580.59 = 647.84 : x
2. Step 2: Convert to fraction form
   1,145.19/1,580.59 = 647.84/x
3. Step 3: Cross multiply
   1,145.19x = 1,580.59 × 647.84
4. Step 4: Simplify right side
   1,145.19x = 1,023,969.43
5. Step 5: Solve for x
   x = 1,023,969.43/1,145.19
6. Step 6: Final answer
   x = 894.15