Finding the Fourth Proportional to 115,965, 160,031.70 and 65,673.72

Step by Step Solution

1. Step 1: Write the proportion equation
   115,965 : 160,031.70 = 65,673.72 : x
2. Step 2: Convert to fraction form
   115,965/160,031.70 = 65,673.72/x
3. Step 3: Cross multiply
   115,965x = 160,031.70 × 65,673.72
4. Step 4: Simplify right side
   115,965x = 10,509,877,056.92
5. Step 5: Solve for x
   x = 10,509,877,056.92/115,965
6. Step 6: Final answer
   x = 90,629.73