Finding the Fourth Proportional to 72,742.28, 100,369.31 and 42,521.76

Step by Step Solution

1. Step 1: Write the proportion equation
   72,742.28 : 100,369.31 = 42,521.76 : x
2. Step 2: Convert to fraction form
   72,742.28/100,369.31 = 42,521.76/x
3. Step 3: Cross multiply
   72,742.28x = 100,369.31 × 42,521.76
4. Step 4: Simplify right side
   72,742.28x = 4,267,879,498.58
5. Step 5: Solve for x
   x = 4,267,879,498.58/72,742.28
6. Step 6: Final answer
   x = 58,671.24