Finding the Fourth Proportional to 115,012.72, 158,709 and 64,702

Step by Step Solution

1. Step 1: Write the proportion equation
   115,012.72 : 158,709 = 64,702 : x
2. Step 2: Convert to fraction form
   115,012.72/158,709 = 64,702/x
3. Step 3: Cross multiply
   115,012.72x = 158,709 × 64,702
4. Step 4: Simplify right side
   115,012.72x = 10,268,789,718
5. Step 5: Solve for x
   x = 10,268,789,718/115,012.72
6. Step 6: Final answer
   x = 89,283.95