Finding the Fourth Proportional to 139,842.70, 209,794.43 and 51,096.06

Step by Step Solution

1. Step 1: Write the proportion equation
   139,842.70 : 209,794.43 = 51,096.06 : x
2. Step 2: Convert to fraction form
   139,842.70/209,794.43 = 51,096.06/x
3. Step 3: Cross multiply
   139,842.70x = 209,794.43 × 51,096.06
4. Step 4: Simplify right side
   139,842.70x = 10,719,669,051.95
5. Step 5: Solve for x
   x = 10,719,669,051.95/139,842.70
6. Step 6: Final answer
   x = 76,655.19