Finding the Fourth Proportional to 139,738.35, 209,640.06 and 39,899.91

Step by Step Solution

1. Step 1: Write the proportion equation
   139,738.35 : 209,640.06 = 39,899.91 : x
2. Step 2: Convert to fraction form
   139,738.35/209,640.06 = 39,899.91/x
3. Step 3: Cross multiply
   139,738.35x = 209,640.06 × 39,899.91
4. Step 4: Simplify right side
   139,738.35x = 8,364,619,526.39
5. Step 5: Solve for x
   x = 8,364,619,526.39/139,738.35
6. Step 6: Final answer
   x = 59,859.15