Finding the Fourth Proportional to 78,249.52, 107,985.72 and 42,440.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,249.52 : 107,985.72 = 42,440.72 : x
2. Step 2: Convert to fraction form
   78,249.52/107,985.72 = 42,440.72/x
3. Step 3: Cross multiply
   78,249.52x = 107,985.72 × 42,440.72
4. Step 4: Simplify right side
   78,249.52x = 4,582,991,706.52
5. Step 5: Solve for x
   x = 4,582,991,706.52/78,249.52
6. Step 6: Final answer
   x = 58,568.94