Finding the Fourth Proportional to 78,621, 108,495.36 and 42,811.62

Step by Step Solution

1. Step 1: Write the proportion equation
   78,621 : 108,495.36 = 42,811.62 : x
2. Step 2: Convert to fraction form
   78,621/108,495.36 = 42,811.62/x
3. Step 3: Cross multiply
   78,621x = 108,495.36 × 42,811.62
4. Step 4: Simplify right side
   78,621x = 4,644,862,124.08
5. Step 5: Solve for x
   x = 4,644,862,124.08/78,621
6. Step 6: Final answer
   x = 59,079.15