Finding the Fourth Proportional to 115,871.50, 159,884.67 and 64,870.66

Step by Step Solution

1. Step 1: Write the proportion equation
   115,871.50 : 159,884.67 = 64,870.66 : x
2. Step 2: Convert to fraction form
   115,871.50/159,884.67 = 64,870.66/x
3. Step 3: Cross multiply
   115,871.50x = 159,884.67 × 64,870.66
4. Step 4: Simplify right side
   115,871.50x = 10,371,824,066.78
5. Step 5: Solve for x
   x = 10,371,824,066.78/115,871.50
6. Step 6: Final answer
   x = 89,511.43