Finding the Fourth Proportional to 139,110.78, 208,595.97 and 99,106.89

Step by Step Solution

1. Step 1: Write the proportion equation
   139,110.78 : 208,595.97 = 99,106.89 : x
2. Step 2: Convert to fraction form
   139,110.78/208,595.97 = 99,106.89/x
3. Step 3: Cross multiply
   139,110.78x = 208,595.97 × 99,106.89
4. Step 4: Simplify right side
   139,110.78x = 20,673,297,853.23
5. Step 5: Solve for x
   x = 20,673,297,853.23/139,110.78
6. Step 6: Final answer
   x = 148,610.32