Finding the Fourth Proportional to 139,799.52, 209,754.72 and 51,058.80

Step by Step Solution

1. Step 1: Write the proportion equation
   139,799.52 : 209,754.72 = 51,058.80 : x
2. Step 2: Convert to fraction form
   139,799.52/209,754.72 = 51,058.80/x
3. Step 3: Cross multiply
   139,799.52x = 209,754.72 × 51,058.80
4. Step 4: Simplify right side
   139,799.52x = 10,709,824,297.54
5. Step 5: Solve for x
   x = 10,709,824,297.54/139,799.52
6. Step 6: Final answer
   x = 76,608.45