Finding the Fourth Proportional to 139,372.95, 208,790.76 and 83,257.98

Step by Step Solution

1. Step 1: Write the proportion equation
   139,372.95 : 208,790.76 = 83,257.98 : x
2. Step 2: Convert to fraction form
   139,372.95/208,790.76 = 83,257.98/x
3. Step 3: Cross multiply
   139,372.95x = 208,790.76 × 83,257.98
4. Step 4: Simplify right side
   139,372.95x = 17,383,496,449.52
5. Step 5: Solve for x
   x = 17,383,496,449.52/139,372.95
6. Step 6: Final answer
   x = 124,726.47