Finding the Fourth Proportional to 2,906.68, 4,357.45 and 1,057.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,906.68 : 4,357.45 = 1,057.47 : x
2. Step 2: Convert to fraction form
   2,906.68/4,357.45 = 1,057.47/x
3. Step 3: Cross multiply
   2,906.68x = 4,357.45 × 1,057.47
4. Step 4: Simplify right side
   2,906.68x = 4,607,885.12
5. Step 5: Solve for x
   x = 4,607,885.12/2,906.68
6. Step 6: Final answer
   x = 1,585.27