Finding the Fourth Proportional to 113,581.16, 156,738.32 and 65,191.05

Step by Step Solution

1. Step 1: Write the proportion equation
   113,581.16 : 156,738.32 = 65,191.05 : x
2. Step 2: Convert to fraction form
   113,581.16/156,738.32 = 65,191.05/x
3. Step 3: Cross multiply
   113,581.16x = 156,738.32 × 65,191.05
4. Step 4: Simplify right side
   113,581.16x = 10,217,935,656.04
5. Step 5: Solve for x
   x = 10,217,935,656.04/113,581.16
6. Step 6: Final answer
   x = 89,961.54