Finding the Fourth Proportional to 1,001.05, 1,381.31 and 581.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,001.05 : 1,381.31 = 581.34 : x
2. Step 2: Convert to fraction form
   1,001.05/1,381.31 = 581.34/x
3. Step 3: Cross multiply
   1,001.05x = 1,381.31 × 581.34
4. Step 4: Simplify right side
   1,001.05x = 803,010.76
5. Step 5: Solve for x
   x = 803,010.76/1,001.05
6. Step 6: Final answer
   x = 802.17