Finding the Fourth Proportional to 139,105,735.58, 208,659,323.19 and 81,557,650.46

Step by Step Solution

1. Step 1: Write the proportion equation
   139,105,735.58 : 208,659,323.19 = 81,557,650.46 : x
2. Step 2: Convert to fraction form
   139,105,735.58/208,659,323.19 = 81,557,650.46/x
3. Step 3: Cross multiply
   139,105,735.58x = 208,659,323.19 × 81,557,650.46
4. Step 4: Simplify right side
   139,105,735.58x = 17,017,764,145,950,190
5. Step 5: Solve for x
   x = 17,017,764,145,950,190/139,105,735.58
6. Step 6: Final answer
   x = 122,336,897.72