Finding the Fourth Proportional to 3,453.69, 5,180.55 and 1,113.87

Step by Step Solution

1. Step 1: Write the proportion equation
   3,453.69 : 5,180.55 = 1,113.87 : x
2. Step 2: Convert to fraction form
   3,453.69/5,180.55 = 1,113.87/x
3. Step 3: Cross multiply
   3,453.69x = 5,180.55 × 1,113.87
4. Step 4: Simplify right side
   3,453.69x = 5,770,445.34
5. Step 5: Solve for x
   x = 5,770,445.34/3,453.69
6. Step 6: Final answer
   x = 1,670.81