Finding the Fourth Proportional to 1,511.42, 2,085.23 and 987.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,511.42 : 2,085.23 = 987.76 : x
2. Step 2: Convert to fraction form
   1,511.42/2,085.23 = 987.76/x
3. Step 3: Cross multiply
   1,511.42x = 2,085.23 × 987.76
4. Step 4: Simplify right side
   1,511.42x = 2,059,691.42
5. Step 5: Solve for x
   x = 2,059,691.42/1,511.42
6. Step 6: Final answer
   x = 1,362.75