Finding the Fourth Proportional to 78,642.78, 108,528.96 and 42,834.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,642.78 : 108,528.96 = 42,834.72 : x
2. Step 2: Convert to fraction form
   78,642.78/108,528.96 = 42,834.72/x
3. Step 3: Cross multiply
   78,642.78x = 108,528.96 × 42,834.72
4. Step 4: Simplify right side
   78,642.78x = 4,648,807,613.49
5. Step 5: Solve for x
   x = 4,648,807,613.49/78,642.78
6. Step 6: Final answer
   x = 59,112.96