Finding the Fourth Proportional to 1,061.00, 1,586.87 and 621.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.00 : 1,586.87 = 621.20 : x
2. Step 2: Convert to fraction form
   1,061.00/1,586.87 = 621.20/x
3. Step 3: Cross multiply
   1,061.00x = 1,586.87 × 621.20
4. Step 4: Simplify right side
   1,061.00x = 985,770.33
5. Step 5: Solve for x
   x = 985,770.33/1,061.00
6. Step 6: Final answer
   x = 929.10