Finding the Fourth Proportional to 1,791.39, 2,471.91 and 1,005.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,791.39 : 2,471.91 = 1,005.30 : x
2. Step 2: Convert to fraction form
   1,791.39/2,471.91 = 1,005.30/x
3. Step 3: Cross multiply
   1,791.39x = 2,471.91 × 1,005.30
4. Step 4: Simplify right side
   1,791.39x = 2,485,011.12
5. Step 5: Solve for x
   x = 2,485,011.12/1,791.39
6. Step 6: Final answer
   x = 1,387.20