Finding the Fourth Proportional to 1,911.82, 2,868.27 and 987.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,911.82 : 2,868.27 = 987.88 : x
2. Step 2: Convert to fraction form
   1,911.82/2,868.27 = 987.88/x
3. Step 3: Cross multiply
   1,911.82x = 2,868.27 × 987.88
4. Step 4: Simplify right side
   1,911.82x = 2,833,506.57
5. Step 5: Solve for x
   x = 2,833,506.57/1,911.82
6. Step 6: Final answer
   x = 1,482.10