Finding the Fourth Proportional to 1,312.38, 1,967.34 and 581.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,312.38 : 1,967.34 = 581.55 : x
2. Step 2: Convert to fraction form
   1,312.38/1,967.34 = 581.55/x
3. Step 3: Cross multiply
   1,312.38x = 1,967.34 × 581.55
4. Step 4: Simplify right side
   1,312.38x = 1,144,096.74
5. Step 5: Solve for x
   x = 1,144,096.74/1,312.38
6. Step 6: Final answer
   x = 871.78