Finding the Fourth Proportional to 1,981.88, 2,971.78 and 1,057.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,981.88 : 2,971.78 = 1,057.19 : x
2. Step 2: Convert to fraction form
   1,981.88/2,971.78 = 1,057.19/x
3. Step 3: Cross multiply
   1,981.88x = 2,971.78 × 1,057.19
4. Step 4: Simplify right side
   1,981.88x = 3,141,736.10
5. Step 5: Solve for x
   x = 3,141,736.10/1,981.88
6. Step 6: Final answer
   x = 1,585.23