Finding the Fourth Proportional to 2,089.94, 3,131.99 and 1,387.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,089.94 : 3,131.99 = 1,387.98 : x
2. Step 2: Convert to fraction form
   2,089.94/3,131.99 = 1,387.98/x
3. Step 3: Cross multiply
   2,089.94x = 3,131.99 × 1,387.98
4. Step 4: Simplify right side
   2,089.94x = 4,347,139.48
5. Step 5: Solve for x
   x = 4,347,139.48/2,089.94
6. Step 6: Final answer
   x = 2,080.03