Finding the Fourth Proportional to 1,558.62, 2,151.92 and 999.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,558.62 : 2,151.92 = 999.32 : x
2. Step 2: Convert to fraction form
   1,558.62/2,151.92 = 999.32/x
3. Step 3: Cross multiply
   1,558.62x = 2,151.92 × 999.32
4. Step 4: Simplify right side
   1,558.62x = 2,150,440.94
5. Step 5: Solve for x
   x = 2,150,440.94/1,558.62
6. Step 6: Final answer
   x = 1,379.71