Finding the Fourth Proportional to 139,478.86, 209,216.40 and 34,298.74

Step by Step Solution

1. Step 1: Write the proportion equation
   139,478.86 : 209,216.40 = 34,298.74 : x
2. Step 2: Convert to fraction form
   139,478.86/209,216.40 = 34,298.74/x
3. Step 3: Cross multiply
   139,478.86x = 209,216.40 × 34,298.74
4. Step 4: Simplify right side
   139,478.86x = 7,175,858,907.34
5. Step 5: Solve for x
   x = 7,175,858,907.34/139,478.86
6. Step 6: Final answer
   x = 51,447.65