Finding the Fourth Proportional to 2,987.55, 4,483.35 and 1,140.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,987.55 : 4,483.35 = 1,140.21 : x
2. Step 2: Convert to fraction form
   2,987.55/4,483.35 = 1,140.21/x
3. Step 3: Cross multiply
   2,987.55x = 4,483.35 × 1,140.21
4. Step 4: Simplify right side
   2,987.55x = 5,111,960.50
5. Step 5: Solve for x
   x = 5,111,960.50/2,987.55
6. Step 6: Final answer
   x = 1,711.09