Finding the Fourth Proportional to 115,881, 159,915.78 and 65,580.12

Step by Step Solution

1. Step 1: Write the proportion equation
   115,881 : 159,915.78 = 65,580.12 : x
2. Step 2: Convert to fraction form
   115,881/159,915.78 = 65,580.12/x
3. Step 3: Cross multiply
   115,881x = 159,915.78 × 65,580.12
4. Step 4: Simplify right side
   115,881x = 10,487,296,042.29
5. Step 5: Solve for x
   x = 10,487,296,042.29/115,881
6. Step 6: Final answer
   x = 90,500.57