Finding the Fourth Proportional to 2,141.81, 3,213.93 and 987.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,141.81 : 3,213.93 = 987.56 : x
2. Step 2: Convert to fraction form
   2,141.81/3,213.93 = 987.56/x
3. Step 3: Cross multiply
   2,141.81x = 3,213.93 × 987.56
4. Step 4: Simplify right side
   2,141.81x = 3,173,960.45
5. Step 5: Solve for x
   x = 3,173,960.45/2,141.81
6. Step 6: Final answer
   x = 1,481.90