Finding the Fourth Proportional to 1,978.11, 2,967.41 and 728.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.11 : 2,967.41 = 728.78 : x
2. Step 2: Convert to fraction form
   1,978.11/2,967.41 = 728.78/x
3. Step 3: Cross multiply
   1,978.11x = 2,967.41 × 728.78
4. Step 4: Simplify right side
   1,978.11x = 2,162,598.30
5. Step 5: Solve for x
   x = 2,162,598.30/1,978.11
6. Step 6: Final answer
   x = 1,093.27