Finding the Fourth Proportional to 78,178.61, 107,886.21 and 42,369.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,178.61 : 107,886.21 = 42,369.50 : x
2. Step 2: Convert to fraction form
   78,178.61/107,886.21 = 42,369.50/x
3. Step 3: Cross multiply
   78,178.61x = 107,886.21 × 42,369.50
4. Step 4: Simplify right side
   78,178.61x = 4,571,084,774.60
5. Step 5: Solve for x
   x = 4,571,084,774.60/78,178.61
6. Step 6: Final answer
   x = 58,469.76