Finding the Fourth Proportional to 139,572.07, 209,191.32 and 50,721.55

Step by Step Solution

1. Step 1: Write the proportion equation
   139,572.07 : 209,191.32 = 50,721.55 : x
2. Step 2: Convert to fraction form
   139,572.07/209,191.32 = 50,721.55/x
3. Step 3: Cross multiply
   139,572.07x = 209,191.32 × 50,721.55
4. Step 4: Simplify right side
   139,572.07x = 10,610,507,996.95
5. Step 5: Solve for x
   x = 10,610,507,996.95/139,572.07
6. Step 6: Final answer
   x = 76,021.71