Finding the Fourth Proportional to 139,928.74, 209,907.72 and 59,974.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,928.74 : 209,907.72 = 59,974.72 : x
2. Step 2: Convert to fraction form
   139,928.74/209,907.72 = 59,974.72/x
3. Step 3: Cross multiply
   139,928.74x = 209,907.72 × 59,974.72
4. Step 4: Simplify right side
   139,928.74x = 12,589,156,732.84
5. Step 5: Solve for x
   x = 12,589,156,732.84/139,928.74
6. Step 6: Final answer
   x = 89,968.34