Finding the Fourth Proportional to 115,022.72, 158,722.80 and 64,712

Step by Step Solution

1. Step 1: Write the proportion equation
   115,022.72 : 158,722.80 = 64,712 : x
2. Step 2: Convert to fraction form
   115,022.72/158,722.80 = 64,712/x
3. Step 3: Cross multiply
   115,022.72x = 158,722.80 × 64,712
4. Step 4: Simplify right side
   115,022.72x = 10,271,269,833.60
5. Step 5: Solve for x
   x = 10,271,269,833.60/115,022.72
6. Step 6: Final answer
   x = 89,297.75