Finding the Fourth Proportional to 139,849.20, 209,846.70 and 60,971.40

Step by Step Solution

1. Step 1: Write the proportion equation
   139,849.20 : 209,846.70 = 60,971.40 : x
2. Step 2: Convert to fraction form
   139,849.20/209,846.70 = 60,971.40/x
3. Step 3: Cross multiply
   139,849.20x = 209,846.70 × 60,971.40
4. Step 4: Simplify right side
   139,849.20x = 12,794,647,084.38
5. Step 5: Solve for x
   x = 12,794,647,084.38/139,849.20
6. Step 6: Final answer
   x = 91,488.88