Finding the Fourth Proportional to 72,036.48, 99,411.84 and 40,206.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72,036.48 : 99,411.84 = 40,206.72 : x
2. Step 2: Convert to fraction form
   72,036.48/99,411.84 = 40,206.72/x
3. Step 3: Cross multiply
   72,036.48x = 99,411.84 × 40,206.72
4. Step 4: Simplify right side
   72,036.48x = 3,997,024,015.56
5. Step 5: Solve for x
   x = 3,997,024,015.56/72,036.48
6. Step 6: Final answer
   x = 55,486.11