Finding the Fourth Proportional to 1,558.33, 2,150.91 and 920.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,558.33 : 2,150.91 = 920.83 : x
2. Step 2: Convert to fraction form
   1,558.33/2,150.91 = 920.83/x
3. Step 3: Cross multiply
   1,558.33x = 2,150.91 × 920.83
4. Step 4: Simplify right side
   1,558.33x = 1,980,622.46
5. Step 5: Solve for x
   x = 1,980,622.46/1,558.33
6. Step 6: Final answer
   x = 1,270.99