Finding the Fourth Proportional to 3,117.96, 4,678.56 and 1,170.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,117.96 : 4,678.56 = 1,170.72 : x
2. Step 2: Convert to fraction form
   3,117.96/4,678.56 = 1,170.72/x
3. Step 3: Cross multiply
   3,117.96x = 4,678.56 × 1,170.72
4. Step 4: Simplify right side
   3,117.96x = 5,477,283.76
5. Step 5: Solve for x
   x = 5,477,283.76/3,117.96
6. Step 6: Final answer
   x = 1,756.69