Finding the Fourth Proportional to 1,170.78, 1,615.98 and 673.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,170.78 : 1,615.98 = 673.47 : x
2. Step 2: Convert to fraction form
   1,170.78/1,615.98 = 673.47/x
3. Step 3: Cross multiply
   1,170.78x = 1,615.98 × 673.47
4. Step 4: Simplify right side
   1,170.78x = 1,088,314.05
5. Step 5: Solve for x
   x = 1,088,314.05/1,170.78
6. Step 6: Final answer
   x = 929.56