Finding the Fourth Proportional to 2,978.34, 4,109.69 and 1,719.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.34 : 4,109.69 = 1,719.20 : x
2. Step 2: Convert to fraction form
   2,978.34/4,109.69 = 1,719.20/x
3. Step 3: Cross multiply
   2,978.34x = 4,109.69 × 1,719.20
4. Step 4: Simplify right side
   2,978.34x = 7,065,349.90
5. Step 5: Solve for x
   x = 7,065,349.90/2,978.34
6. Step 6: Final answer
   x = 2,372.24