Finding the Fourth Proportional to 2,620.72, 3,929.88 and 888.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.72 : 3,929.88 = 888.16 : x
2. Step 2: Convert to fraction form
   2,620.72/3,929.88 = 888.16/x
3. Step 3: Cross multiply
   2,620.72x = 3,929.88 × 888.16
4. Step 4: Simplify right side
   2,620.72x = 3,490,362.22
5. Step 5: Solve for x
   x = 3,490,362.22/2,620.72
6. Step 6: Final answer
   x = 1,331.83