Finding the Fourth Proportional to 1,180.64, 1,628.39 and 781.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,180.64 : 1,628.39 = 781.59 : x
2. Step 2: Convert to fraction form
   1,180.64/1,628.39 = 781.59/x
3. Step 3: Cross multiply
   1,180.64x = 1,628.39 × 781.59
4. Step 4: Simplify right side
   1,180.64x = 1,272,729.43
5. Step 5: Solve for x
   x = 1,272,729.43/1,180.64
6. Step 6: Final answer
   x = 1,078.00