Finding the Fourth Proportional to 78,419.15, 108,218.24 and 42,609.30

Step by Step Solution

1. Step 1: Write the proportion equation
   78,419.15 : 108,218.24 = 42,609.30 : x
2. Step 2: Convert to fraction form
   78,419.15/108,218.24 = 42,609.30/x
3. Step 3: Cross multiply
   78,419.15x = 108,218.24 × 42,609.30
4. Step 4: Simplify right side
   78,419.15x = 4,611,103,453.63
5. Step 5: Solve for x
   x = 4,611,103,453.63/78,419.15
6. Step 6: Final answer
   x = 58,800.73