Finding the Fourth Proportional to 78,298.98, 108,053.38 and 42,489.30

Step by Step Solution

1. Step 1: Write the proportion equation
   78,298.98 : 108,053.38 = 42,489.30 : x
2. Step 2: Convert to fraction form
   78,298.98/108,053.38 = 42,489.30/x
3. Step 3: Cross multiply
   78,298.98x = 108,053.38 × 42,489.30
4. Step 4: Simplify right side
   78,298.98x = 4,591,112,478.83
5. Step 5: Solve for x
   x = 4,591,112,478.83/78,298.98
6. Step 6: Final answer
   x = 58,635.66