Finding the Fourth Proportional to 1,308.76, 1,963.78 and 577.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.76 : 1,963.78 = 577.46 : x
2. Step 2: Convert to fraction form
   1,308.76/1,963.78 = 577.46/x
3. Step 3: Cross multiply
   1,308.76x = 1,963.78 × 577.46
4. Step 4: Simplify right side
   1,308.76x = 1,134,007.86
5. Step 5: Solve for x
   x = 1,134,007.86/1,308.76
6. Step 6: Final answer
   x = 866.48