Finding the Fourth Proportional to 5,085.31, 7,015.39 and 2,987.95

Step by Step Solution

1. Step 1: Write the proportion equation
   5,085.31 : 7,015.39 = 2,987.95 : x
2. Step 2: Convert to fraction form
   5,085.31/7,015.39 = 2,987.95/x
3. Step 3: Cross multiply
   5,085.31x = 7,015.39 × 2,987.95
4. Step 4: Simplify right side
   5,085.31x = 20,961,634.55
5. Step 5: Solve for x
   x = 20,961,634.55/5,085.31
6. Step 6: Final answer
   x = 4,122.00