Finding the Fourth Proportional to 78,145.72, 107,840.24 and 42,333.60

Step by Step Solution

1. Step 1: Write the proportion equation
   78,145.72 : 107,840.24 = 42,333.60 : x
2. Step 2: Convert to fraction form
   78,145.72/107,840.24 = 42,333.60/x
3. Step 3: Cross multiply
   78,145.72x = 107,840.24 × 42,333.60
4. Step 4: Simplify right side
   78,145.72x = 4,565,265,584.06
5. Step 5: Solve for x
   x = 4,565,265,584.06/78,145.72
6. Step 6: Final answer
   x = 58,419.91