Finding the Fourth Proportional to 1,978.06, 2,967.69 and 1,111.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.06 : 2,967.69 = 1,111.75 : x
2. Step 2: Convert to fraction form
   1,978.06/2,967.69 = 1,111.75/x
3. Step 3: Cross multiply
   1,978.06x = 2,967.69 × 1,111.75
4. Step 4: Simplify right side
   1,978.06x = 3,299,329.36
5. Step 5: Solve for x
   x = 3,299,329.36/1,978.06
6. Step 6: Final answer
   x = 1,667.96