Finding the Fourth Proportional to 1,620.57, 2,429.91 and 889.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,620.57 : 2,429.91 = 889.95 : x
2. Step 2: Convert to fraction form
   1,620.57/2,429.91 = 889.95/x
3. Step 3: Cross multiply
   1,620.57x = 2,429.91 × 889.95
4. Step 4: Simplify right side
   1,620.57x = 2,162,498.40
5. Step 5: Solve for x
   x = 2,162,498.40/1,620.57
6. Step 6: Final answer
   x = 1,334.41