Finding the Fourth Proportional to 78,456.42, 108,270.54 and 42,646.47

Step by Step Solution

1. Step 1: Write the proportion equation
   78,456.42 : 108,270.54 = 42,646.47 : x
2. Step 2: Convert to fraction form
   78,456.42/108,270.54 = 42,646.47/x
3. Step 3: Cross multiply
   78,456.42x = 108,270.54 × 42,646.47
4. Step 4: Simplify right side
   78,456.42x = 4,617,356,335.99
5. Step 5: Solve for x
   x = 4,617,356,335.99/78,456.42
6. Step 6: Final answer
   x = 58,852.50