Finding the Fourth Proportional to 139,105,734.58, 208,659,321.69 and 81,557,649.46

Step by Step Solution

1. Step 1: Write the proportion equation
   139,105,734.58 : 208,659,321.69 = 81,557,649.46 : x
2. Step 2: Convert to fraction form
   139,105,734.58/208,659,321.69 = 81,557,649.46/x
3. Step 3: Cross multiply
   139,105,734.58x = 208,659,321.69 × 81,557,649.46
4. Step 4: Simplify right side
   139,105,734.58x = 17,017,763,814,954,394
5. Step 5: Solve for x
   x = 17,017,763,814,954,394/139,105,734.58
6. Step 6: Final answer
   x = 122,336,896.22