Finding the Fourth Proportional to 1,631.76, 2,251.84 and 885.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,631.76 : 2,251.84 = 885.72 : x
2. Step 2: Convert to fraction form
   1,631.76/2,251.84 = 885.72/x
3. Step 3: Cross multiply
   1,631.76x = 2,251.84 × 885.72
4. Step 4: Simplify right side
   1,631.76x = 1,994,499.72
5. Step 5: Solve for x
   x = 1,994,499.72/1,631.76
6. Step 6: Final answer
   x = 1,222.30