Finding the Fourth Proportional to 1,312.17, 1,967.94 and 581.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,312.17 : 1,967.94 = 581.34 : x
2. Step 2: Convert to fraction form
   1,312.17/1,967.94 = 581.34/x
3. Step 3: Cross multiply
   1,312.17x = 1,967.94 × 581.34
4. Step 4: Simplify right side
   1,312.17x = 1,144,042.24
5. Step 5: Solve for x
   x = 1,144,042.24/1,312.17
6. Step 6: Final answer
   x = 871.87