Finding the Fourth Proportional to 139,905.69, 209,888.52 and 45,141.27

Step by Step Solution

1. Step 1: Write the proportion equation
   139,905.69 : 209,888.52 = 45,141.27 : x
2. Step 2: Convert to fraction form
   139,905.69/209,888.52 = 45,141.27/x
3. Step 3: Cross multiply
   139,905.69x = 209,888.52 × 45,141.27
4. Step 4: Simplify right side
   139,905.69x = 9,474,634,351.22
5. Step 5: Solve for x
   x = 9,474,634,351.22/139,905.69
6. Step 6: Final answer
   x = 67,721.58