Finding the Fourth Proportional to 2,980.62, 4,111.86 and 1,918.11

Step by Step Solution

1. Step 1: Write the proportion equation
   2,980.62 : 4,111.86 = 1,918.11 : x
2. Step 2: Convert to fraction form
   2,980.62/4,111.86 = 1,918.11/x
3. Step 3: Cross multiply
   2,980.62x = 4,111.86 × 1,918.11
4. Step 4: Simplify right side
   2,980.62x = 7,886,999.78
5. Step 5: Solve for x
   x = 7,886,999.78/2,980.62
6. Step 6: Final answer
   x = 2,646.09