Finding the Fourth Proportional to 1,978.02, 2,729.61 and 1,191.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.02 : 2,729.61 = 1,191.92 : x
2. Step 2: Convert to fraction form
   1,978.02/2,729.61 = 1,191.92/x
3. Step 3: Cross multiply
   1,978.02x = 2,729.61 × 1,191.92
4. Step 4: Simplify right side
   1,978.02x = 3,253,463.10
5. Step 5: Solve for x
   x = 3,253,463.10/1,978.02
6. Step 6: Final answer
   x = 1,644.81