Finding the Fourth Proportional to 139,633.56, 209,418.80 and 39,791.61

Step by Step Solution

1. Step 1: Write the proportion equation
   139,633.56 : 209,418.80 = 39,791.61 : x
2. Step 2: Convert to fraction form
   139,633.56/209,418.80 = 39,791.61/x
3. Step 3: Cross multiply
   139,633.56x = 209,418.80 × 39,791.61
4. Step 4: Simplify right side
   139,633.56x = 8,333,111,017.31
5. Step 5: Solve for x
   x = 8,333,111,017.31/139,633.56
6. Step 6: Final answer
   x = 59,678.43