Finding the Fourth Proportional to 1,371.15, 1,892.25 and 811.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.15 : 1,892.25 = 811.95 : x
2. Step 2: Convert to fraction form
   1,371.15/1,892.25 = 811.95/x
3. Step 3: Cross multiply
   1,371.15x = 1,892.25 × 811.95
4. Step 4: Simplify right side
   1,371.15x = 1,536,412.39
5. Step 5: Solve for x
   x = 1,536,412.39/1,371.15
6. Step 6: Final answer
   x = 1,120.53