Finding the Fourth Proportional to 3,680.81, 5,518.31 and 1,830.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,680.81 : 5,518.31 = 1,830.91 : x
2. Step 2: Convert to fraction form
   3,680.81/5,518.31 = 1,830.91/x
3. Step 3: Cross multiply
   3,680.81x = 5,518.31 × 1,830.91
4. Step 4: Simplify right side
   3,680.81x = 10,103,538.18
5. Step 5: Solve for x
   x = 10,103,538.18/3,680.81
6. Step 6: Final answer
   x = 2,744.92