Finding the Fourth Proportional to 267.98, 402.72 and 139.82

Step by Step Solution

1. Step 1: Write the proportion equation
   267.98 : 402.72 = 139.82 : x
2. Step 2: Convert to fraction form
   267.98/402.72 = 139.82/x
3. Step 3: Cross multiply
   267.98x = 402.72 × 139.82
4. Step 4: Simplify right side
   267.98x = 56,308.31
5. Step 5: Solve for x
   x = 56,308.31/267.98
6. Step 6: Final answer
   x = 210.12