Finding the Fourth Proportional to 115,705.64, 159,669.42 and 65,405.72

Step by Step Solution

1. Step 1: Write the proportion equation
   115,705.64 : 159,669.42 = 65,405.72 : x
2. Step 2: Convert to fraction form
   115,705.64/159,669.42 = 65,405.72/x
3. Step 3: Cross multiply
   115,705.64x = 159,669.42 × 65,405.72
4. Step 4: Simplify right side
   115,705.64x = 10,443,293,377.08
5. Step 5: Solve for x
   x = 10,443,293,377.08/115,705.64
6. Step 6: Final answer
   x = 90,257.43