Finding the Fourth Proportional to 72,471.82, 99,990.54 and 42,258.40

Step by Step Solution

1. Step 1: Write the proportion equation
   72,471.82 : 99,990.54 = 42,258.40 : x
2. Step 2: Convert to fraction form
   72,471.82/99,990.54 = 42,258.40/x
3. Step 3: Cross multiply
   72,471.82x = 99,990.54 × 42,258.40
4. Step 4: Simplify right side
   72,471.82x = 4,225,440,235.54
5. Step 5: Solve for x
   x = 4,225,440,235.54/72,471.82
6. Step 6: Final answer
   x = 58,304.60