Finding the Fourth Proportional to 78,776.64, 108,705.60 and 42,964.56

Step by Step Solution

1. Step 1: Write the proportion equation
   78,776.64 : 108,705.60 = 42,964.56 : x
2. Step 2: Convert to fraction form
   78,776.64/108,705.60 = 42,964.56/x
3. Step 3: Cross multiply
   78,776.64x = 108,705.60 × 42,964.56
4. Step 4: Simplify right side
   78,776.64x = 4,670,488,273.54
5. Step 5: Solve for x
   x = 4,670,488,273.54/78,776.64
6. Step 6: Final answer
   x = 59,287.73