Finding the Fourth Proportional to 1,216.34, 1,826.94 and 890.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.34 : 1,826.94 = 890.72 : x
2. Step 2: Convert to fraction form
   1,216.34/1,826.94 = 890.72/x
3. Step 3: Cross multiply
   1,216.34x = 1,826.94 × 890.72
4. Step 4: Simplify right side
   1,216.34x = 1,627,292.00
5. Step 5: Solve for x
   x = 1,627,292.00/1,216.34
6. Step 6: Final answer
   x = 1,337.86