Finding the Fourth Proportional to 72,045.16, 99,410.43 and 40,214.05

Step by Step Solution

1. Step 1: Write the proportion equation
   72,045.16 : 99,410.43 = 40,214.05 : x
2. Step 2: Convert to fraction form
   72,045.16/99,410.43 = 40,214.05/x
3. Step 3: Cross multiply
   72,045.16x = 99,410.43 × 40,214.05
4. Step 4: Simplify right side
   72,045.16x = 3,997,696,002.54
5. Step 5: Solve for x
   x = 3,997,696,002.54/72,045.16
6. Step 6: Final answer
   x = 55,488.75