Finding the Fourth Proportional to 72,020.91, 99,388.71 and 40,187.91

Step by Step Solution

1. Step 1: Write the proportion equation
   72,020.91 : 99,388.71 = 40,187.91 : x
2. Step 2: Convert to fraction form
   72,020.91/99,388.71 = 40,187.91/x
3. Step 3: Cross multiply
   72,020.91x = 99,388.71 × 40,187.91
4. Step 4: Simplify right side
   72,020.91x = 3,994,224,532.50
5. Step 5: Solve for x
   x = 3,994,224,532.50/72,020.91
6. Step 6: Final answer
   x = 55,459.23