Finding the Fourth Proportional to 1,145.47, 1,717.86 and 487.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.47 : 1,717.86 = 487.34 : x
2. Step 2: Convert to fraction form
   1,145.47/1,717.86 = 487.34/x
3. Step 3: Cross multiply
   1,145.47x = 1,717.86 × 487.34
4. Step 4: Simplify right side
   1,145.47x = 837,181.89
5. Step 5: Solve for x
   x = 837,181.89/1,145.47
6. Step 6: Final answer
   x = 730.86