Finding the Fourth Proportional to 101.34, 139.72 and 99.98

Step by Step Solution

1. Step 1: Write the proportion equation
   101.34 : 139.72 = 99.98 : x
2. Step 2: Convert to fraction form
   101.34/139.72 = 99.98/x
3. Step 3: Cross multiply
   101.34x = 139.72 × 99.98
4. Step 4: Simplify right side
   101.34x = 13,969.21
5. Step 5: Solve for x
   x = 13,969.21/101.34
6. Step 6: Final answer
   x = 137.84