Finding the Fourth Proportional to 2,978.02, 4,109.86 and 1,719.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.02 : 4,109.86 = 1,719.31 : x
2. Step 2: Convert to fraction form
   2,978.02/4,109.86 = 1,719.31/x
3. Step 3: Cross multiply
   2,978.02x = 4,109.86 × 1,719.31
4. Step 4: Simplify right side
   2,978.02x = 7,066,101.75
5. Step 5: Solve for x
   x = 7,066,101.75/2,978.02
6. Step 6: Final answer
   x = 2,372.75