Finding the Fourth Proportional to 115,017.69, 158,720.70 and 64,028.76

Step by Step Solution

1. Step 1: Write the proportion equation
   115,017.69 : 158,720.70 = 64,028.76 : x
2. Step 2: Convert to fraction form
   115,017.69/158,720.70 = 64,028.76/x
3. Step 3: Cross multiply
   115,017.69x = 158,720.70 × 64,028.76
4. Step 4: Simplify right side
   115,017.69x = 10,162,689,607.33
5. Step 5: Solve for x
   x = 10,162,689,607.33/115,017.69
6. Step 6: Final answer
   x = 88,357.62