Finding the Fourth Proportional to 115,826.67, 159,840.86 and 64,839.50

Step by Step Solution

1. Step 1: Write the proportion equation
   115,826.67 : 159,840.86 = 64,839.50 : x
2. Step 2: Convert to fraction form
   115,826.67/159,840.86 = 64,839.50/x
3. Step 3: Cross multiply
   115,826.67x = 159,840.86 × 64,839.50
4. Step 4: Simplify right side
   115,826.67x = 10,364,001,441.97
5. Step 5: Solve for x
   x = 10,364,001,441.97/115,826.67
6. Step 6: Final answer
   x = 89,478.54