Finding the Fourth Proportional to 2,158.22, 3,238.32 and 988.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.22 : 3,238.32 = 988.58 : x
2. Step 2: Convert to fraction form
   2,158.22/3,238.32 = 988.58/x
3. Step 3: Cross multiply
   2,158.22x = 3,238.32 × 988.58
4. Step 4: Simplify right side
   2,158.22x = 3,201,338.39
5. Step 5: Solve for x
   x = 3,201,338.39/2,158.22
6. Step 6: Final answer
   x = 1,483.32