Finding the Fourth Proportional to 78,789.46, 108,729.28 and 42,979.48

Step by Step Solution

1. Step 1: Write the proportion equation
   78,789.46 : 108,729.28 = 42,979.48 : x
2. Step 2: Convert to fraction form
   78,789.46/108,729.28 = 42,979.48/x
3. Step 3: Cross multiply
   78,789.46x = 108,729.28 × 42,979.48
4. Step 4: Simplify right side
   78,789.46x = 4,673,127,915.17
5. Step 5: Solve for x
   x = 4,673,127,915.17/78,789.46
6. Step 6: Final answer
   x = 59,311.59