Finding the Fourth Proportional to 72,578.49, 100,140.78 and 42,346.56

Step by Step Solution

1. Step 1: Write the proportion equation
   72,578.49 : 100,140.78 = 42,346.56 : x
2. Step 2: Convert to fraction form
   72,578.49/100,140.78 = 42,346.56/x
3. Step 3: Cross multiply
   72,578.49x = 100,140.78 × 42,346.56
4. Step 4: Simplify right side
   72,578.49x = 4,240,617,548.72
5. Step 5: Solve for x
   x = 4,240,617,548.72/72,578.49
6. Step 6: Final answer
   x = 58,428.02