Finding the Fourth Proportional to 101.35, 139.71 and 99.98

Step by Step Solution

1. Step 1: Write the proportion equation
   101.35 : 139.71 = 99.98 : x
2. Step 2: Convert to fraction form
   101.35/139.71 = 99.98/x
3. Step 3: Cross multiply
   101.35x = 139.71 × 99.98
4. Step 4: Simplify right side
   101.35x = 13,968.21
5. Step 5: Solve for x
   x = 13,968.21/101.35
6. Step 6: Final answer
   x = 137.82