Finding the Fourth Proportional to 77,978.07, 107,609.99 and 42,168.34

Step by Step Solution

1. Step 1: Write the proportion equation
   77,978.07 : 107,609.99 = 42,168.34 : x
2. Step 2: Convert to fraction form
   77,978.07/107,609.99 = 42,168.34/x
3. Step 3: Cross multiply
   77,978.07x = 107,609.99 × 42,168.34
4. Step 4: Simplify right side
   77,978.07x = 4,537,734,645.72
5. Step 5: Solve for x
   x = 4,537,734,645.72/77,978.07
6. Step 6: Final answer
   x = 58,192.45