Finding the Fourth Proportional to 72,471.71, 100,008.78 and 40,208.00

Step by Step Solution

1. Step 1: Write the proportion equation
   72,471.71 : 100,008.78 = 40,208.00 : x
2. Step 2: Convert to fraction form
   72,471.71/100,008.78 = 40,208.00/x
3. Step 3: Cross multiply
   72,471.71x = 100,008.78 × 40,208.00
4. Step 4: Simplify right side
   72,471.71x = 4,021,152,375.42
5. Step 5: Solve for x
   x = 4,021,152,375.42/72,471.71
6. Step 6: Final answer
   x = 55,485.82