Finding the Fourth Proportional to 2,978.78, 4,110.89 and 1,720.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.78 : 4,110.89 = 1,720.06 : x
2. Step 2: Convert to fraction form
   2,978.78/4,110.89 = 1,720.06/x
3. Step 3: Cross multiply
   2,978.78x = 4,110.89 × 1,720.06
4. Step 4: Simplify right side
   2,978.78x = 7,070,977.45
5. Step 5: Solve for x
   x = 7,070,977.45/2,978.78
6. Step 6: Final answer
   x = 2,373.79