Finding the Fourth Proportional to 139,843.20, 209,795.18 and 51,096.57

Step by Step Solution

1. Step 1: Write the proportion equation
   139,843.20 : 209,795.18 = 51,096.57 : x
2. Step 2: Convert to fraction form
   139,843.20/209,795.18 = 51,096.57/x
3. Step 3: Cross multiply
   139,843.20x = 209,795.18 × 51,096.57
4. Step 4: Simplify right side
   139,843.20x = 10,719,812,796.07
5. Step 5: Solve for x
   x = 10,719,812,796.07/139,843.20
6. Step 6: Final answer
   x = 76,655.95