Finding the Fourth Proportional to 1,362.78, 1,881.84 and 1,012.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,362.78 : 1,881.84 = 1,012.86 : x
2. Step 2: Convert to fraction form
   1,362.78/1,881.84 = 1,012.86/x
3. Step 3: Cross multiply
   1,362.78x = 1,881.84 × 1,012.86
4. Step 4: Simplify right side
   1,362.78x = 1,906,040.46
5. Step 5: Solve for x
   x = 1,906,040.46/1,362.78
6. Step 6: Final answer
   x = 1,398.64