Finding the Fourth Proportional to 1,034.50, 1,426.80 and 641.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,034.50 : 1,426.80 = 641.30 : x
2. Step 2: Convert to fraction form
   1,034.50/1,426.80 = 641.30/x
3. Step 3: Cross multiply
   1,034.50x = 1,426.80 × 641.30
4. Step 4: Simplify right side
   1,034.50x = 915,006.84
5. Step 5: Solve for x
   x = 915,006.84/1,034.50
6. Step 6: Final answer
   x = 884.49