Finding the Fourth Proportional to 139,105,736.58, 208,659,324.69 and 81,557,651.46

Step by Step Solution

1. Step 1: Write the proportion equation
   139,105,736.58 : 208,659,324.69 = 81,557,651.46 : x
2. Step 2: Convert to fraction form
   139,105,736.58/208,659,324.69 = 81,557,651.46/x
3. Step 3: Cross multiply
   139,105,736.58x = 208,659,324.69 × 81,557,651.46
4. Step 4: Simplify right side
   139,105,736.58x = 17,017,764,476,945,990
5. Step 5: Solve for x
   x = 17,017,764,476,945,990/139,105,736.58
6. Step 6: Final answer
   x = 122,336,899.22