Finding the Fourth Proportional to 139.86, 193.02 and 100.53

Step by Step Solution

1. Step 1: Write the proportion equation
   139.86 : 193.02 = 100.53 : x
2. Step 2: Convert to fraction form
   139.86/193.02 = 100.53/x
3. Step 3: Cross multiply
   139.86x = 193.02 × 100.53
4. Step 4: Simplify right side
   139.86x = 19,404.30
5. Step 5: Solve for x
   x = 19,404.30/139.86
6. Step 6: Final answer
   x = 138.74