Finding the Fourth Proportional to 1,031.59, 1,423.76 and 812.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,031.59 : 1,423.76 = 812.21 : x
2. Step 2: Convert to fraction form
   1,031.59/1,423.76 = 812.21/x
3. Step 3: Cross multiply
   1,031.59x = 1,423.76 × 812.21
4. Step 4: Simplify right side
   1,031.59x = 1,156,392.11
5. Step 5: Solve for x
   x = 1,156,392.11/1,031.59
6. Step 6: Final answer
   x = 1,120.98