Finding the Fourth Proportional to 1,028.07, 1,542.15 and 619.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,028.07 : 1,542.15 = 619.83 : x
2. Step 2: Convert to fraction form
   1,028.07/1,542.15 = 619.83/x
3. Step 3: Cross multiply
   1,028.07x = 1,542.15 × 619.83
4. Step 4: Simplify right side
   1,028.07x = 955,870.83
5. Step 5: Solve for x
   x = 955,870.83/1,028.07
6. Step 6: Final answer
   x = 929.77