Finding the Fourth Proportional to 78,797.74, 108,743.62 and 42,989.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,797.74 : 108,743.62 = 42,989.72 : x
2. Step 2: Convert to fraction form
   78,797.74/108,743.62 = 42,989.72/x
3. Step 3: Cross multiply
   78,797.74x = 108,743.62 × 42,989.72
4. Step 4: Simplify right side
   78,797.74x = 4,674,857,775.59
5. Step 5: Solve for x
   x = 4,674,857,775.59/78,797.74
6. Step 6: Final answer
   x = 59,327.31