Finding the Fourth Proportional to 1,012.34, 1,518.38 and 281.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.34 : 1,518.38 = 281.86 : x
2. Step 2: Convert to fraction form
   1,012.34/1,518.38 = 281.86/x
3. Step 3: Cross multiply
   1,012.34x = 1,518.38 × 281.86
4. Step 4: Simplify right side
   1,012.34x = 427,970.59
5. Step 5: Solve for x
   x = 427,970.59/1,012.34
6. Step 6: Final answer
   x = 422.75