Finding the Fourth Proportional to 72,402.61, 99,919.56 and 40,581.76

Step by Step Solution

1. Step 1: Write the proportion equation
   72,402.61 : 99,919.56 = 40,581.76 : x
2. Step 2: Convert to fraction form
   72,402.61/99,919.56 = 40,581.76/x
3. Step 3: Cross multiply
   72,402.61x = 99,919.56 × 40,581.76
4. Step 4: Simplify right side
   72,402.61x = 4,054,911,603.23
5. Step 5: Solve for x
   x = 4,054,911,603.23/72,402.61
6. Step 6: Final answer
   x = 56,005.05