Finding the Fourth Proportional to 2,538.30, 3,807.72 and 1,989.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,538.30 : 3,807.72 = 1,989.48 : x
2. Step 2: Convert to fraction form
   2,538.30/3,807.72 = 1,989.48/x
3. Step 3: Cross multiply
   2,538.30x = 3,807.72 × 1,989.48
4. Step 4: Simplify right side
   2,538.30x = 7,575,382.79
5. Step 5: Solve for x
   x = 7,575,382.79/2,538.30
6. Step 6: Final answer
   x = 2,984.43