Finding the Fourth Proportional to 139,111.26, 208,596.72 and 99,107.40

Step by Step Solution

1. Step 1: Write the proportion equation
   139,111.26 : 208,596.72 = 99,107.40 : x
2. Step 2: Convert to fraction form
   139,111.26/208,596.72 = 99,107.40/x
3. Step 3: Cross multiply
   139,111.26x = 208,596.72 × 99,107.40
4. Step 4: Simplify right side
   139,111.26x = 20,673,478,567.73
5. Step 5: Solve for x
   x = 20,673,478,567.73/139,111.26
6. Step 6: Final answer
   x = 148,611.11