Finding the Fourth Proportional to 78,140.78, 107,834.78 and 42,330.77

Step by Step Solution

1. Step 1: Write the proportion equation
   78,140.78 : 107,834.78 = 42,330.77 : x
2. Step 2: Convert to fraction form
   78,140.78/107,834.78 = 42,330.77/x
3. Step 3: Cross multiply
   78,140.78x = 107,834.78 × 42,330.77
4. Step 4: Simplify right side
   78,140.78x = 4,564,729,003.10
5. Step 5: Solve for x
   x = 4,564,729,003.10/78,140.78
6. Step 6: Final answer
   x = 58,416.73