Finding the Fourth Proportional to 42,678.24, 58,921.20 and 30,772.32

Step by Step Solution

1. Step 1: Write the proportion equation
   42,678.24 : 58,921.20 = 30,772.32 : x
2. Step 2: Convert to fraction form
   42,678.24/58,921.20 = 30,772.32/x
3. Step 3: Cross multiply
   42,678.24x = 58,921.20 × 30,772.32
4. Step 4: Simplify right side
   42,678.24x = 1,813,142,021.18
5. Step 5: Solve for x
   x = 1,813,142,021.18/42,678.24
6. Step 6: Final answer
   x = 42,483.99