Finding the Fourth Proportional to 1,902.78, 2,856.80 and 1,316.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,902.78 : 2,856.80 = 1,316.34 : x
2. Step 2: Convert to fraction form
   1,902.78/2,856.80 = 1,316.34/x
3. Step 3: Cross multiply
   1,902.78x = 2,856.80 × 1,316.34
4. Step 4: Simplify right side
   1,902.78x = 3,760,513.53
5. Step 5: Solve for x
   x = 3,760,513.53/1,902.78
6. Step 6: Final answer
   x = 1,976.33