Finding the Fourth Proportional to 1,145.31, 1,580.53 and 647.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.31 : 1,580.53 = 647.96 : x
2. Step 2: Convert to fraction form
   1,145.31/1,580.53 = 647.96/x
3. Step 3: Cross multiply
   1,145.31x = 1,580.53 × 647.96
4. Step 4: Simplify right side
   1,145.31x = 1,024,110.29
5. Step 5: Solve for x
   x = 1,024,110.29/1,145.31
6. Step 6: Final answer
   x = 894.18