Finding the Fourth Proportional to 72,113.99, 99,508.34 and 40,288.88

Step by Step Solution

1. Step 1: Write the proportion equation
   72,113.99 : 99,508.34 = 40,288.88 : x
2. Step 2: Convert to fraction form
   72,113.99/99,508.34 = 40,288.88/x
3. Step 3: Cross multiply
   72,113.99x = 99,508.34 × 40,288.88
4. Step 4: Simplify right side
   72,113.99x = 4,009,078,870.27
5. Step 5: Solve for x
   x = 4,009,078,870.27/72,113.99
6. Step 6: Final answer
   x = 55,593.64