Finding the Fourth Proportional to 72,188.69, 99,620.61 and 40,357.58

Step by Step Solution

1. Step 1: Write the proportion equation
   72,188.69 : 99,620.61 = 40,357.58 : x
2. Step 2: Convert to fraction form
   72,188.69/99,620.61 = 40,357.58/x
3. Step 3: Cross multiply
   72,188.69x = 99,620.61 × 40,357.58
4. Step 4: Simplify right side
   72,188.69x = 4,020,446,535.94
5. Step 5: Solve for x
   x = 4,020,446,535.94/72,188.69
6. Step 6: Final answer
   x = 55,693.58