Finding the Fourth Proportional to 139,788.93, 209,690.29 and 39,963.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,788.93 : 209,690.29 = 39,963.72 : x
2. Step 2: Convert to fraction form
   139,788.93/209,690.29 = 39,963.72/x
3. Step 3: Cross multiply
   139,788.93x = 209,690.29 × 39,963.72
4. Step 4: Simplify right side
   139,788.93x = 8,380,004,036.28
5. Step 5: Solve for x
   x = 8,380,004,036.28/139,788.93
6. Step 6: Final answer
   x = 59,947.55