Finding the Fourth Proportional to 1,980.79, 2,734.77 and 1,235.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,980.79 : 2,734.77 = 1,235.05 : x
2. Step 2: Convert to fraction form
   1,980.79/2,734.77 = 1,235.05/x
3. Step 3: Cross multiply
   1,980.79x = 2,734.77 × 1,235.05
4. Step 4: Simplify right side
   1,980.79x = 3,377,577.69
5. Step 5: Solve for x
   x = 3,377,577.69/1,980.79
6. Step 6: Final answer
   x = 1,705.17