Finding the Fourth Proportional to 1,171.20, 1,615.94 and 673.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,171.20 : 1,615.94 = 673.98 : x
2. Step 2: Convert to fraction form
   1,171.20/1,615.94 = 673.98/x
3. Step 3: Cross multiply
   1,171.20x = 1,615.94 × 673.98
4. Step 4: Simplify right side
   1,171.20x = 1,089,111.24
5. Step 5: Solve for x
   x = 1,089,111.24/1,171.20
6. Step 6: Final answer
   x = 929.91