Finding the Fourth Proportional to 139,926.42, 209,889.56 and 51,131.48

Step by Step Solution

1. Step 1: Write the proportion equation
   139,926.42 : 209,889.56 = 51,131.48 : x
2. Step 2: Convert to fraction form
   139,926.42/209,889.56 = 51,131.48/x
3. Step 3: Cross multiply
   139,926.42x = 209,889.56 × 51,131.48
4. Step 4: Simplify right side
   139,926.42x = 10,731,962,917.73
5. Step 5: Solve for x
   x = 10,731,962,917.73/139,926.42
6. Step 6: Final answer
   x = 76,697.19