Finding the Fourth Proportional to 1,081.42, 1,620.86 and 619.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.42 : 1,620.86 = 619.52 : x
2. Step 2: Convert to fraction form
   1,081.42/1,620.86 = 619.52/x
3. Step 3: Cross multiply
   1,081.42x = 1,620.86 × 619.52
4. Step 4: Simplify right side
   1,081.42x = 1,004,143.99
5. Step 5: Solve for x
   x = 1,004,143.99/1,081.42
6. Step 6: Final answer
   x = 928.54