Finding the Fourth Proportional to 139,953.01, 209,907.87 and 51,185.76

Step by Step Solution

1. Step 1: Write the proportion equation
   139,953.01 : 209,907.87 = 51,185.76 : x
2. Step 2: Convert to fraction form
   139,953.01/209,907.87 = 51,185.76/x
3. Step 3: Cross multiply
   139,953.01x = 209,907.87 × 51,185.76
4. Step 4: Simplify right side
   139,953.01x = 10,744,292,806.39
5. Step 5: Solve for x
   x = 10,744,292,806.39/139,953.01
6. Step 6: Final answer
   x = 76,770.72