Finding the Fourth Proportional to 77,978.66, 107,610.16 and 42,168.59

Step by Step Solution

1. Step 1: Write the proportion equation
   77,978.66 : 107,610.16 = 42,168.59 : x
2. Step 2: Convert to fraction form
   77,978.66/107,610.16 = 42,168.59/x
3. Step 3: Cross multiply
   77,978.66x = 107,610.16 × 42,168.59
4. Step 4: Simplify right side
   77,978.66x = 4,537,768,716.87
5. Step 5: Solve for x
   x = 4,537,768,716.87/77,978.66
6. Step 6: Final answer
   x = 58,192.44