Finding the Fourth Proportional to 78,789.42, 108,729.72 and 42,980.22

Step by Step Solution

1. Step 1: Write the proportion equation
   78,789.42 : 108,729.72 = 42,980.22 : x
2. Step 2: Convert to fraction form
   78,789.42/108,729.72 = 42,980.22/x
3. Step 3: Cross multiply
   78,789.42x = 108,729.72 × 42,980.22
4. Step 4: Simplify right side
   78,789.42x = 4,673,227,286.14
5. Step 5: Solve for x
   x = 4,673,227,286.14/78,789.42
6. Step 6: Final answer
   x = 59,312.88