Finding the Fourth Proportional to 72,002.01, 99,363.06 and 40,172.25

Step by Step Solution

1. Step 1: Write the proportion equation
   72,002.01 : 99,363.06 = 40,172.25 : x
2. Step 2: Convert to fraction form
   72,002.01/99,363.06 = 40,172.25/x
3. Step 3: Cross multiply
   72,002.01x = 99,363.06 × 40,172.25
4. Step 4: Simplify right side
   72,002.01x = 3,991,637,687.09
5. Step 5: Solve for x
   x = 3,991,637,687.09/72,002.01
6. Step 6: Final answer
   x = 55,437.86