Finding the Fourth Proportional to 1,427.78, 1,973.61 and 1,312.97

Step by Step Solution

1. Step 1: Write the proportion equation
   1,427.78 : 1,973.61 = 1,312.97 : x
2. Step 2: Convert to fraction form
   1,427.78/1,973.61 = 1,312.97/x
3. Step 3: Cross multiply
   1,427.78x = 1,973.61 × 1,312.97
4. Step 4: Simplify right side
   1,427.78x = 2,591,280.85
5. Step 5: Solve for x
   x = 2,591,280.85/1,427.78
6. Step 6: Final answer
   x = 1,814.91