Finding the Fourth Proportional to 867.99, 1,300.83 and 380.51

Step by Step Solution

1. Step 1: Write the proportion equation
   867.99 : 1,300.83 = 380.51 : x
2. Step 2: Convert to fraction form
   867.99/1,300.83 = 380.51/x
3. Step 3: Cross multiply
   867.99x = 1,300.83 × 380.51
4. Step 4: Simplify right side
   867.99x = 494,978.82
5. Step 5: Solve for x
   x = 494,978.82/867.99
6. Step 6: Final answer
   x = 570.26