Finding the Fourth Proportional to 78,419.50, 108,219.31 and 42,609.60

Step by Step Solution

1. Step 1: Write the proportion equation
   78,419.50 : 108,219.31 = 42,609.60 : x
2. Step 2: Convert to fraction form
   78,419.50/108,219.31 = 42,609.60/x
3. Step 3: Cross multiply
   78,419.50x = 108,219.31 × 42,609.60
4. Step 4: Simplify right side
   78,419.50x = 4,611,181,404.85
5. Step 5: Solve for x
   x = 4,611,181,404.85/78,419.50
6. Step 6: Final answer
   x = 58,801.47