Finding the Fourth Proportional to 1,511.48, 2,085.31 and 987.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,511.48 : 2,085.31 = 987.82 : x
2. Step 2: Convert to fraction form
   1,511.48/2,085.31 = 987.82/x
3. Step 3: Cross multiply
   1,511.48x = 2,085.31 × 987.82
4. Step 4: Simplify right side
   1,511.48x = 2,059,906.95
5. Step 5: Solve for x
   x = 2,059,906.95/1,511.48
6. Step 6: Final answer
   x = 1,362.84