Finding the Fourth Proportional to 78,797.72, 108,743.60 and 42,989.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,797.72 : 108,743.60 = 42,989.72 : x
2. Step 2: Convert to fraction form
   78,797.72/108,743.60 = 42,989.72/x
3. Step 3: Cross multiply
   78,797.72x = 108,743.60 × 42,989.72
4. Step 4: Simplify right side
   78,797.72x = 4,674,856,915.79
5. Step 5: Solve for x
   x = 4,674,856,915.79/78,797.72
6. Step 6: Final answer
   x = 59,327.31