Finding the Fourth Proportional to 139,467.69, 209,199.71 and 34,287.57

Step by Step Solution

1. Step 1: Write the proportion equation
   139,467.69 : 209,199.71 = 34,287.57 : x
2. Step 2: Convert to fraction form
   139,467.69/209,199.71 = 34,287.57/x
3. Step 3: Cross multiply
   139,467.69x = 209,199.71 × 34,287.57
4. Step 4: Simplify right side
   139,467.69x = 7,172,949,786.32
5. Step 5: Solve for x
   x = 7,172,949,786.32/139,467.69
6. Step 6: Final answer
   x = 51,430.91