Finding the Fourth Proportional to 115,200.09, 158,976.90 and 64,216.12

Step by Step Solution

1. Step 1: Write the proportion equation
   115,200.09 : 158,976.90 = 64,216.12 : x
2. Step 2: Convert to fraction form
   115,200.09/158,976.90 = 64,216.12/x
3. Step 3: Cross multiply
   115,200.09x = 158,976.90 × 64,216.12
4. Step 4: Simplify right side
   115,200.09x = 10,208,879,687.63
5. Step 5: Solve for x
   x = 10,208,879,687.63/115,200.09
6. Step 6: Final answer
   x = 88,618.68