Finding the Fourth Proportional to 1,624.76, 2,242.17 and 878.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,624.76 : 2,242.17 = 878.72 : x
2. Step 2: Convert to fraction form
   1,624.76/2,242.17 = 878.72/x
3. Step 3: Cross multiply
   1,624.76x = 2,242.17 × 878.72
4. Step 4: Simplify right side
   1,624.76x = 1,970,236.82
5. Step 5: Solve for x
   x = 1,970,236.82/1,624.76
6. Step 6: Final answer
   x = 1,212.63