Finding the Fourth Proportional to 115,019.30, 158,726.30 and 64,718.30

Step by Step Solution

1. Step 1: Write the proportion equation
   115,019.30 : 158,726.30 = 64,718.30 : x
2. Step 2: Convert to fraction form
   115,019.30/158,726.30 = 64,718.30/x
3. Step 3: Cross multiply
   115,019.30x = 158,726.30 × 64,718.30
4. Step 4: Simplify right side
   115,019.30x = 10,272,496,301.29
5. Step 5: Solve for x
   x = 10,272,496,301.29/115,019.30
6. Step 6: Final answer
   x = 89,311.07