Finding the Fourth Proportional to 113,408.48, 156,493.53 and 65,665.05

Step by Step Solution

1. Step 1: Write the proportion equation
   113,408.48 : 156,493.53 = 65,665.05 : x
2. Step 2: Convert to fraction form
   113,408.48/156,493.53 = 65,665.05/x
3. Step 3: Cross multiply
   113,408.48x = 156,493.53 × 65,665.05
4. Step 4: Simplify right side
   113,408.48x = 10,276,155,472.13
5. Step 5: Solve for x
   x = 10,276,155,472.13/113,408.48
6. Step 6: Final answer
   x = 90,611.88