Finding the Fourth Proportional to 139,571.12, 209,356.79 and 34,390.10

Step by Step Solution

1. Step 1: Write the proportion equation
   139,571.12 : 209,356.79 = 34,390.10 : x
2. Step 2: Convert to fraction form
   139,571.12/209,356.79 = 34,390.10/x
3. Step 3: Cross multiply
   139,571.12x = 209,356.79 × 34,390.10
4. Step 4: Simplify right side
   139,571.12x = 7,199,799,725.04
5. Step 5: Solve for x
   x = 7,199,799,725.04/139,571.12
6. Step 6: Final answer
   x = 51,585.17