Finding the Fourth Proportional to 1,420.78, 1,959.78 and 948.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420.78 : 1,959.78 = 948.82 : x
2. Step 2: Convert to fraction form
   1,420.78/1,959.78 = 948.82/x
3. Step 3: Cross multiply
   1,420.78x = 1,959.78 × 948.82
4. Step 4: Simplify right side
   1,420.78x = 1,859,478.46
5. Step 5: Solve for x
   x = 1,859,478.46/1,420.78
6. Step 6: Final answer
   x = 1,308.77