Finding the Fourth Proportional to 139,454.94, 209,131.77 and 76,321.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,454.94 : 209,131.77 = 76,321.72 : x
2. Step 2: Convert to fraction form
   139,454.94/209,131.77 = 76,321.72/x
3. Step 3: Cross multiply
   139,454.94x = 209,131.77 × 76,321.72
4. Step 4: Simplify right side
   139,454.94x = 15,961,296,393.04
5. Step 5: Solve for x
   x = 15,961,296,393.04/139,454.94
6. Step 6: Final answer
   x = 114,454.87