Finding the Fourth Proportional to 139,131.87, 191,788.93 and 85,317.09

Step by Step Solution

1. Step 1: Write the proportion equation
   139,131.87 : 191,788.93 = 85,317.09 : x
2. Step 2: Convert to fraction form
   139,131.87/191,788.93 = 85,317.09/x
3. Step 3: Cross multiply
   139,131.87x = 191,788.93 × 85,317.09
4. Step 4: Simplify right side
   139,131.87x = 16,362,873,401.81
5. Step 5: Solve for x
   x = 16,362,873,401.81/139,131.87
6. Step 6: Final answer
   x = 117,606.94