Finding the Fourth Proportional to 2,300.90, 3,451.58 and 839.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,300.90 : 3,451.58 = 839.72 : x
2. Step 2: Convert to fraction form
   2,300.90/3,451.58 = 839.72/x
3. Step 3: Cross multiply
   2,300.90x = 3,451.58 × 839.72
4. Step 4: Simplify right side
   2,300.90x = 2,898,339.30
5. Step 5: Solve for x
   x = 2,898,339.30/2,300.90
6. Step 6: Final answer
   x = 1,259.65