Finding the Fourth Proportional to 1,271.43, 1,905.84 and 612.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,271.43 : 1,905.84 = 612.34 : x
2. Step 2: Convert to fraction form
   1,271.43/1,905.84 = 612.34/x
3. Step 3: Cross multiply
   1,271.43x = 1,905.84 × 612.34
4. Step 4: Simplify right side
   1,271.43x = 1,167,017.30
5. Step 5: Solve for x
   x = 1,167,017.30/1,271.43
6. Step 6: Final answer
   x = 917.88