Finding the Fourth Proportional to 1,978.32, 2,961.60 and 1,282.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.32 : 2,961.60 = 1,282.96 : x
2. Step 2: Convert to fraction form
   1,978.32/2,961.60 = 1,282.96/x
3. Step 3: Cross multiply
   1,978.32x = 2,961.60 × 1,282.96
4. Step 4: Simplify right side
   1,978.32x = 3,799,614.34
5. Step 5: Solve for x
   x = 3,799,614.34/1,978.32
6. Step 6: Final answer
   x = 1,920.63