Finding the Fourth Proportional to 115,019.12, 158,724.76 and 64,718

Step by Step Solution

1. Step 1: Write the proportion equation
   115,019.12 : 158,724.76 = 64,718 : x
2. Step 2: Convert to fraction form
   115,019.12/158,724.76 = 64,718/x
3. Step 3: Cross multiply
   115,019.12x = 158,724.76 × 64,718
4. Step 4: Simplify right side
   115,019.12x = 10,272,349,017.68
5. Step 5: Solve for x
   x = 10,272,349,017.68/115,019.12
6. Step 6: Final answer
   x = 89,309.93