Finding the Fourth Proportional to 140,593.04, 194,012.20 and 86,128.56

Step by Step Solution

1. Step 1: Write the proportion equation
   140,593.04 : 194,012.20 = 86,128.56 : x
2. Step 2: Convert to fraction form
   140,593.04/194,012.20 = 86,128.56/x
3. Step 3: Cross multiply
   140,593.04x = 194,012.20 × 86,128.56
4. Step 4: Simplify right side
   140,593.04x = 16,709,991,408.43
5. Step 5: Solve for x
   x = 16,709,991,408.43/140,593.04
6. Step 6: Final answer
   x = 118,853.62