Finding the Fourth Proportional to 1,152.79, 1,590.85 and 628.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152.79 : 1,590.85 = 628.82 : x
2. Step 2: Convert to fraction form
   1,152.79/1,590.85 = 628.82/x
3. Step 3: Cross multiply
   1,152.79x = 1,590.85 × 628.82
4. Step 4: Simplify right side
   1,152.79x = 1,000,358.30
5. Step 5: Solve for x
   x = 1,000,358.30/1,152.79
6. Step 6: Final answer
   x = 867.77