Finding the Fourth Proportional to 1,152.34, 1,590.18 and 628.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152.34 : 1,590.18 = 628.37 : x
2. Step 2: Convert to fraction form
   1,152.34/1,590.18 = 628.37/x
3. Step 3: Cross multiply
   1,152.34x = 1,590.18 × 628.37
4. Step 4: Simplify right side
   1,152.34x = 999,221.41
5. Step 5: Solve for x
   x = 999,221.41/1,152.34
6. Step 6: Final answer
   x = 867.12