Finding the Fourth Proportional to 72,278.43, 99,764.36 and 42,069.61

Step by Step Solution

1. Step 1: Write the proportion equation
   72,278.43 : 99,764.36 = 42,069.61 : x
2. Step 2: Convert to fraction form
   72,278.43/99,764.36 = 42,069.61/x
3. Step 3: Cross multiply
   72,278.43x = 99,764.36 × 42,069.61
4. Step 4: Simplify right side
   72,278.43x = 4,197,047,717.10
5. Step 5: Solve for x
   x = 4,197,047,717.10/72,278.43
6. Step 6: Final answer
   x = 58,067.78