Finding the Fourth Proportional to 115,706.64, 159,670.80 and 65,406.72

Step by Step Solution

1. Step 1: Write the proportion equation
   115,706.64 : 159,670.80 = 65,406.72 : x
2. Step 2: Convert to fraction form
   115,706.64/159,670.80 = 65,406.72/x
3. Step 3: Cross multiply
   115,706.64x = 159,670.80 × 65,406.72
4. Step 4: Simplify right side
   115,706.64x = 10,443,543,307.78
5. Step 5: Solve for x
   x = 10,443,543,307.78/115,706.64
6. Step 6: Final answer
   x = 90,258.81