Finding the Fourth Proportional to 2,619.96, 3,930.12 and 888.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,619.96 : 3,930.12 = 888.72 : x
2. Step 2: Convert to fraction form
   2,619.96/3,930.12 = 888.72/x
3. Step 3: Cross multiply
   2,619.96x = 3,930.12 × 888.72
4. Step 4: Simplify right side
   2,619.96x = 3,492,776.25
5. Step 5: Solve for x
   x = 3,492,776.25/2,619.96
6. Step 6: Final answer
   x = 1,333.14