Finding the Fourth Proportional to 1,091.17, 1,505.46 and 619.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.17 : 1,505.46 = 619.02 : x
2. Step 2: Convert to fraction form
   1,091.17/1,505.46 = 619.02/x
3. Step 3: Cross multiply
   1,091.17x = 1,505.46 × 619.02
4. Step 4: Simplify right side
   1,091.17x = 931,915.16
5. Step 5: Solve for x
   x = 931,915.16/1,091.17
6. Step 6: Final answer
   x = 854.06