Finding the Fourth Proportional to 10,185.51, 15,276.20 and 2,789.40

Step by Step Solution

1. Step 1: Write the proportion equation
   10,185.51 : 15,276.20 = 2,789.40 : x
2. Step 2: Convert to fraction form
   10,185.51/15,276.20 = 2,789.40/x
3. Step 3: Cross multiply
   10,185.51x = 15,276.20 × 2,789.40
4. Step 4: Simplify right side
   10,185.51x = 42,611,475.62
5. Step 5: Solve for x
   x = 42,611,475.62/10,185.51
6. Step 6: Final answer
   x = 4,183.54