Finding the Fourth Proportional to 72,039.00, 99,409.78 and 40,209.95

Step by Step Solution

1. Step 1: Write the proportion equation
   72,039.00 : 99,409.78 = 40,209.95 : x
2. Step 2: Convert to fraction form
   72,039.00/99,409.78 = 40,209.95/x
3. Step 3: Cross multiply
   72,039.00x = 99,409.78 × 40,209.95
4. Step 4: Simplify right side
   72,039.00x = 3,997,262,582.10
5. Step 5: Solve for x
   x = 3,997,262,582.10/72,039.00
6. Step 6: Final answer
   x = 55,487.48