Finding the Fourth Proportional to 139,424.84, 209,139.56 and 72,994.71

Step by Step Solution

1. Step 1: Write the proportion equation
   139,424.84 : 209,139.56 = 72,994.71 : x
2. Step 2: Convert to fraction form
   139,424.84/209,139.56 = 72,994.71/x
3. Step 3: Cross multiply
   139,424.84x = 209,139.56 × 72,994.71
4. Step 4: Simplify right side
   139,424.84x = 15,266,082,436.98
5. Step 5: Solve for x
   x = 15,266,082,436.98/139,424.84
6. Step 6: Final answer
   x = 109,493.28