Finding the Fourth Proportional to 139,927.86, 209,922.98 and 51,179.40

Step by Step Solution

1. Step 1: Write the proportion equation
   139,927.86 : 209,922.98 = 51,179.40 : x
2. Step 2: Convert to fraction form
   139,927.86/209,922.98 = 51,179.40/x
3. Step 3: Cross multiply
   139,927.86x = 209,922.98 × 51,179.40
4. Step 4: Simplify right side
   139,927.86x = 10,743,731,906.72
5. Step 5: Solve for x
   x = 10,743,731,906.72/139,927.86
6. Step 6: Final answer
   x = 76,780.51