Finding the Fourth Proportional to 1,424.31, 2,137.47 and 904.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,424.31 : 2,137.47 = 904.71 : x
2. Step 2: Convert to fraction form
   1,424.31/2,137.47 = 904.71/x
3. Step 3: Cross multiply
   1,424.31x = 2,137.47 × 904.71
4. Step 4: Simplify right side
   1,424.31x = 1,933,790.48
5. Step 5: Solve for x
   x = 1,933,790.48/1,424.31
6. Step 6: Final answer
   x = 1,357.70