Finding the Fourth Proportional to 2,161.89, 3,242.31 and 929.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,161.89 : 3,242.31 = 929.88 : x
2. Step 2: Convert to fraction form
   2,161.89/3,242.31 = 929.88/x
3. Step 3: Cross multiply
   2,161.89x = 3,242.31 × 929.88
4. Step 4: Simplify right side
   2,161.89x = 3,014,959.22
5. Step 5: Solve for x
   x = 3,014,959.22/2,161.89
6. Step 6: Final answer
   x = 1,394.59