Finding the Fourth Proportional to 78,138.12, 107,830.89 and 42,328.04

Step by Step Solution

1. Step 1: Write the proportion equation
   78,138.12 : 107,830.89 = 42,328.04 : x
2. Step 2: Convert to fraction form
   78,138.12/107,830.89 = 42,328.04/x
3. Step 3: Cross multiply
   78,138.12x = 107,830.89 × 42,328.04
4. Step 4: Simplify right side
   78,138.12x = 4,564,270,013.52
5. Step 5: Solve for x
   x = 4,564,270,013.52/78,138.12
6. Step 6: Final answer
   x = 58,412.85