Finding the Fourth Proportional to 1,061.56, 1,590.62 and 628.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.56 : 1,590.62 = 628.20 : x
2. Step 2: Convert to fraction form
   1,061.56/1,590.62 = 628.20/x
3. Step 3: Cross multiply
   1,061.56x = 1,590.62 × 628.20
4. Step 4: Simplify right side
   1,061.56x = 999,227.48
5. Step 5: Solve for x
   x = 999,227.48/1,061.56
6. Step 6: Final answer
   x = 941.28