Finding the Fourth Proportional to 1,145.34, 1,580.58 and 647.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.34 : 1,580.58 = 647.96 : x
2. Step 2: Convert to fraction form
   1,145.34/1,580.58 = 647.96/x
3. Step 3: Cross multiply
   1,145.34x = 1,580.58 × 647.96
4. Step 4: Simplify right side
   1,145.34x = 1,024,144.71
5. Step 5: Solve for x
   x = 1,024,144.71/1,145.34
6. Step 6: Final answer
   x = 894.18