Finding the Fourth Proportional to 1,088.09, 1,631.42 and 619.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,088.09 : 1,631.42 = 619.57 : x
2. Step 2: Convert to fraction form
   1,088.09/1,631.42 = 619.57/x
3. Step 3: Cross multiply
   1,088.09x = 1,631.42 × 619.57
4. Step 4: Simplify right side
   1,088.09x = 1,010,778.89
5. Step 5: Solve for x
   x = 1,010,778.89/1,088.09
6. Step 6: Final answer
   x = 928.95