Finding the Fourth Proportional to 42,878.47, 59,142.75 and 30,158.64

Step by Step Solution

1. Step 1: Write the proportion equation
   42,878.47 : 59,142.75 = 30,158.64 : x
2. Step 2: Convert to fraction form
   42,878.47/59,142.75 = 30,158.64/x
3. Step 3: Cross multiply
   42,878.47x = 59,142.75 × 30,158.64
4. Step 4: Simplify right side
   42,878.47x = 1,783,664,905.86
5. Step 5: Solve for x
   x = 1,783,664,905.86/42,878.47
6. Step 6: Final answer
   x = 41,598.15