Finding the Fourth Proportional to 2,978.40, 4,109.88 and 1,860.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.40 : 4,109.88 = 1,860.60 : x
2. Step 2: Convert to fraction form
   2,978.40/4,109.88 = 1,860.60/x
3. Step 3: Cross multiply
   2,978.40x = 4,109.88 × 1,860.60
4. Step 4: Simplify right side
   2,978.40x = 7,646,842.73
5. Step 5: Solve for x
   x = 7,646,842.73/2,978.40
6. Step 6: Final answer
   x = 2,567.43