Finding the Fourth Proportional to 1,342.98, 2,002.73 and 1,288.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,342.98 : 2,002.73 = 1,288.31 : x
2. Step 2: Convert to fraction form
   1,342.98/2,002.73 = 1,288.31/x
3. Step 3: Cross multiply
   1,342.98x = 2,002.73 × 1,288.31
4. Step 4: Simplify right side
   1,342.98x = 2,580,120.63
5. Step 5: Solve for x
   x = 2,580,120.63/1,342.98
6. Step 6: Final answer
   x = 1,921.19