Finding the Fourth Proportional to 139,437, 209,188.31 and 45,942.75

Step by Step Solution

1. Step 1: Write the proportion equation
   139,437 : 209,188.31 = 45,942.75 : x
2. Step 2: Convert to fraction form
   139,437/209,188.31 = 45,942.75/x
3. Step 3: Cross multiply
   139,437x = 209,188.31 × 45,942.75
4. Step 4: Simplify right side
   139,437x = 9,610,685,999.54
5. Step 5: Solve for x
   x = 9,610,685,999.54/139,437
6. Step 6: Final answer
   x = 68,924.93