Finding the Fourth Proportional to 78,420.42, 117,564.50 and 34,013.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,420.42 : 117,564.50 = 34,013.72 : x
2. Step 2: Convert to fraction form
   78,420.42/117,564.50 = 34,013.72/x
3. Step 3: Cross multiply
   78,420.42x = 117,564.50 × 34,013.72
4. Step 4: Simplify right side
   78,420.42x = 3,998,806,108.78
5. Step 5: Solve for x
   x = 3,998,806,108.78/78,420.42
6. Step 6: Final answer
   x = 50,991.90