Finding the Fourth Proportional to 1,143.06, 1,577.42 and 619.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,143.06 : 1,577.42 = 619.10 : x
2. Step 2: Convert to fraction form
   1,143.06/1,577.42 = 619.10/x
3. Step 3: Cross multiply
   1,143.06x = 1,577.42 × 619.10
4. Step 4: Simplify right side
   1,143.06x = 976,580.72
5. Step 5: Solve for x
   x = 976,580.72/1,143.06
6. Step 6: Final answer
   x = 854.36