Finding the Fourth Proportional to 1,791.71, 2,472.61 and 1,005.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,791.71 : 2,472.61 = 1,005.78 : x
2. Step 2: Convert to fraction form
   1,791.71/2,472.61 = 1,005.78/x
3. Step 3: Cross multiply
   1,791.71x = 2,472.61 × 1,005.78
4. Step 4: Simplify right side
   1,791.71x = 2,486,901.69
5. Step 5: Solve for x
   x = 2,486,901.69/1,791.71
6. Step 6: Final answer
   x = 1,388.00