Finding the Fourth Proportional to 115,020.30, 158,727.69 and 64,719.30

Step by Step Solution

1. Step 1: Write the proportion equation
   115,020.30 : 158,727.69 = 64,719.30 : x
2. Step 2: Convert to fraction form
   115,020.30/158,727.69 = 64,719.30/x
3. Step 3: Cross multiply
   115,020.30x = 158,727.69 × 64,719.30
4. Step 4: Simplify right side
   115,020.30x = 10,272,744,987.42
5. Step 5: Solve for x
   x = 10,272,744,987.42/115,020.30
6. Step 6: Final answer
   x = 89,312.45