Finding the Fourth Proportional to 3,870.18, 5,807.32 and 1,680.44

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.18 : 5,807.32 = 1,680.44 : x
2. Step 2: Convert to fraction form
   3,870.18/5,807.32 = 1,680.44/x
3. Step 3: Cross multiply
   3,870.18x = 5,807.32 × 1,680.44
4. Step 4: Simplify right side
   3,870.18x = 9,758,858.94
5. Step 5: Solve for x
   x = 9,758,858.94/3,870.18
6. Step 6: Final answer
   x = 2,521.55