Finding the Fourth Proportional to 2,978.13, 4,109.79 and 1,719.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.13 : 4,109.79 = 1,719.90 : x
2. Step 2: Convert to fraction form
   2,978.13/4,109.79 = 1,719.90/x
3. Step 3: Cross multiply
   2,978.13x = 4,109.79 × 1,719.90
4. Step 4: Simplify right side
   2,978.13x = 7,068,427.82
5. Step 5: Solve for x
   x = 7,068,427.82/2,978.13
6. Step 6: Final answer
   x = 2,373.45