Finding the Fourth Proportional to 77,978.42, 107,609.81 and 42,168.34

Step by Step Solution

1. Step 1: Write the proportion equation
   77,978.42 : 107,609.81 = 42,168.34 : x
2. Step 2: Convert to fraction form
   77,978.42/107,609.81 = 42,168.34/x
3. Step 3: Cross multiply
   77,978.42x = 107,609.81 × 42,168.34
4. Step 4: Simplify right side
   77,978.42x = 4,537,726,891.81
5. Step 5: Solve for x
   x = 4,537,726,891.81/77,978.42
6. Step 6: Final answer
   x = 58,192.09