Finding the Fourth Proportional to 72,189.16, 99,608.88 and 40,358.32

Step by Step Solution

1. Step 1: Write the proportion equation
   72,189.16 : 99,608.88 = 40,358.32 : x
2. Step 2: Convert to fraction form
   72,189.16/99,608.88 = 40,358.32/x
3. Step 3: Cross multiply
   72,189.16x = 99,608.88 × 40,358.32
4. Step 4: Simplify right side
   72,189.16x = 4,020,047,053.88
5. Step 5: Solve for x
   x = 4,020,047,053.88/72,189.16
6. Step 6: Final answer
   x = 55,687.68