Finding the Fourth Proportional to 2,978.92, 4,111.09 and 1,720.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.92 : 4,111.09 = 1,720.20 : x
2. Step 2: Convert to fraction form
   2,978.92/4,111.09 = 1,720.20/x
3. Step 3: Cross multiply
   2,978.92x = 4,111.09 × 1,720.20
4. Step 4: Simplify right side
   2,978.92x = 7,071,897.02
5. Step 5: Solve for x
   x = 7,071,897.02/2,978.92
6. Step 6: Final answer
   x = 2,373.98