Finding the Fourth Proportional to 78,138.03, 107,830.05 and 42,328.74

Step by Step Solution

1. Step 1: Write the proportion equation
   78,138.03 : 107,830.05 = 42,328.74 : x
2. Step 2: Convert to fraction form
   78,138.03/107,830.05 = 42,328.74/x
3. Step 3: Cross multiply
   78,138.03x = 107,830.05 × 42,328.74
4. Step 4: Simplify right side
   78,138.03x = 4,564,310,150.64
5. Step 5: Solve for x
   x = 4,564,310,150.64/78,138.03
6. Step 6: Final answer
   x = 58,413.43