Finding the Fourth Proportional to 78,673.48, 108,570.66 and 42,865

Step by Step Solution

1. Step 1: Write the proportion equation
   78,673.48 : 108,570.66 = 42,865 : x
2. Step 2: Convert to fraction form
   78,673.48/108,570.66 = 42,865/x
3. Step 3: Cross multiply
   78,673.48x = 108,570.66 × 42,865
4. Step 4: Simplify right side
   78,673.48x = 4,653,881,340.90
5. Step 5: Solve for x
   x = 4,653,881,340.90/78,673.48
6. Step 6: Final answer
   x = 59,154.39