Finding the Fourth Proportional to 139,412.34, 209,105.69 and 45,918.09

Step by Step Solution

1. Step 1: Write the proportion equation
   139,412.34 : 209,105.69 = 45,918.09 : x
2. Step 2: Convert to fraction form
   139,412.34/209,105.69 = 45,918.09/x
3. Step 3: Cross multiply
   139,412.34x = 209,105.69 × 45,918.09
4. Step 4: Simplify right side
   139,412.34x = 9,601,733,663.34
5. Step 5: Solve for x
   x = 9,601,733,663.34/139,412.34
6. Step 6: Final answer
   x = 68,872.91