Finding the Fourth Proportional to 1,281.42, 1,921.52 and 459.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,281.42 : 1,921.52 = 459.47 : x
2. Step 2: Convert to fraction form
   1,281.42/1,921.52 = 459.47/x
3. Step 3: Cross multiply
   1,281.42x = 1,921.52 × 459.47
4. Step 4: Simplify right side
   1,281.42x = 882,886.75
5. Step 5: Solve for x
   x = 882,886.75/1,281.42
6. Step 6: Final answer
   x = 688.99