Finding the Fourth Proportional to 981.69, 1,354.72 and 562.21

Step by Step Solution

1. Step 1: Write the proportion equation
   981.69 : 1,354.72 = 562.21 : x
2. Step 2: Convert to fraction form
   981.69/1,354.72 = 562.21/x
3. Step 3: Cross multiply
   981.69x = 1,354.72 × 562.21
4. Step 4: Simplify right side
   981.69x = 761,627.55
5. Step 5: Solve for x
   x = 761,627.55/981.69
6. Step 6: Final answer
   x = 775.84