Finding the Fourth Proportional to 1,981.59, 2,971.27 and 811.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,981.59 : 2,971.27 = 811.27 : x
2. Step 2: Convert to fraction form
   1,981.59/2,971.27 = 811.27/x
3. Step 3: Cross multiply
   1,981.59x = 2,971.27 × 811.27
4. Step 4: Simplify right side
   1,981.59x = 2,410,502.21
5. Step 5: Solve for x
   x = 2,410,502.21/1,981.59
6. Step 6: Final answer
   x = 1,216.45