Finding the Fourth Proportional to 1,558.32, 2,150.55 and 928.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,558.32 : 2,150.55 = 928.68 : x
2. Step 2: Convert to fraction form
   1,558.32/2,150.55 = 928.68/x
3. Step 3: Cross multiply
   1,558.32x = 2,150.55 × 928.68
4. Step 4: Simplify right side
   1,558.32x = 1,997,172.77
5. Step 5: Solve for x
   x = 1,997,172.77/1,558.32
6. Step 6: Final answer
   x = 1,281.62