Finding the Fourth Proportional to 139,538.93, 209,067.62 and 76,404.47

Step by Step Solution

1. Step 1: Write the proportion equation
   139,538.93 : 209,067.62 = 76,404.47 : x
2. Step 2: Convert to fraction form
   139,538.93/209,067.62 = 76,404.47/x
3. Step 3: Cross multiply
   139,538.93x = 209,067.62 × 76,404.47
4. Step 4: Simplify right side
   139,538.93x = 15,973,699,272.90
5. Step 5: Solve for x
   x = 15,973,699,272.90/139,538.93
6. Step 6: Final answer
   x = 114,474.86