Finding the Fourth Proportional to 1,023.55, 1,412.53 and 581.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,023.55 : 1,412.53 = 581.51 : x
2. Step 2: Convert to fraction form
   1,023.55/1,412.53 = 581.51/x
3. Step 3: Cross multiply
   1,023.55x = 1,412.53 × 581.51
4. Step 4: Simplify right side
   1,023.55x = 821,402.40
5. Step 5: Solve for x
   x = 821,402.40/1,023.55
6. Step 6: Final answer
   x = 802.51