Finding the Fourth Proportional to 1,284.22, 1,926.41 and 347.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,284.22 : 1,926.41 = 347.31 : x
2. Step 2: Convert to fraction form
   1,284.22/1,926.41 = 347.31/x
3. Step 3: Cross multiply
   1,284.22x = 1,926.41 × 347.31
4. Step 4: Simplify right side
   1,284.22x = 669,061.46
5. Step 5: Solve for x
   x = 669,061.46/1,284.22
6. Step 6: Final answer
   x = 520.99