Finding the Fourth Proportional to 2,621.52, 3,613.50 and 1,989.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.52 : 3,613.50 = 1,989.99 : x
2. Step 2: Convert to fraction form
   2,621.52/3,613.50 = 1,989.99/x
3. Step 3: Cross multiply
   2,621.52x = 3,613.50 × 1,989.99
4. Step 4: Simplify right side
   2,621.52x = 7,190,828.87
5. Step 5: Solve for x
   x = 7,190,828.87/2,621.52
6. Step 6: Final answer
   x = 2,743.00