Finding the Fourth Proportional to 1,064.43, 1,471.14 and 815.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,064.43 : 1,471.14 = 815.76 : x
2. Step 2: Convert to fraction form
   1,064.43/1,471.14 = 815.76/x
3. Step 3: Cross multiply
   1,064.43x = 1,471.14 × 815.76
4. Step 4: Simplify right side
   1,064.43x = 1,200,097.17
5. Step 5: Solve for x
   x = 1,200,097.17/1,064.43
6. Step 6: Final answer
   x = 1,127.46