Finding the Fourth Proportional to 1,091.59, 1,505.95 and 619.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.59 : 1,505.95 = 619.38 : x
2. Step 2: Convert to fraction form
   1,091.59/1,505.95 = 619.38/x
3. Step 3: Cross multiply
   1,091.59x = 1,505.95 × 619.38
4. Step 4: Simplify right side
   1,091.59x = 932,757.53
5. Step 5: Solve for x
   x = 932,757.53/1,091.59
6. Step 6: Final answer
   x = 854.49