Finding the Fourth Proportional to 2,087.88, 3,131.87 and 1,538.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.88 : 3,131.87 = 1,538.39 : x
2. Step 2: Convert to fraction form
   2,087.88/3,131.87 = 1,538.39/x
3. Step 3: Cross multiply
   2,087.88x = 3,131.87 × 1,538.39
4. Step 4: Simplify right side
   2,087.88x = 4,818,037.63
5. Step 5: Solve for x
   x = 4,818,037.63/2,087.88
6. Step 6: Final answer
   x = 2,307.63