Finding the Fourth Proportional to 3,666.31, 5,059.47 and 1,987.67

Step by Step Solution

1. Step 1: Write the proportion equation
   3,666.31 : 5,059.47 = 1,987.67 : x
2. Step 2: Convert to fraction form
   3,666.31/5,059.47 = 1,987.67/x
3. Step 3: Cross multiply
   3,666.31x = 5,059.47 × 1,987.67
4. Step 4: Simplify right side
   3,666.31x = 10,056,556.73
5. Step 5: Solve for x
   x = 10,056,556.73/3,666.31
6. Step 6: Final answer
   x = 2,742.96