Finding the Fourth Proportional to 78,411.60, 108,208.68 and 42,601.68

Step by Step Solution

1. Step 1: Write the proportion equation
   78,411.60 : 108,208.68 = 42,601.68 : x
2. Step 2: Convert to fraction form
   78,411.60/108,208.68 = 42,601.68/x
3. Step 3: Cross multiply
   78,411.60x = 108,208.68 × 42,601.68
4. Step 4: Simplify right side
   78,411.60x = 4,609,871,558.58
5. Step 5: Solve for x
   x = 4,609,871,558.58/78,411.60
6. Step 6: Final answer
   x = 58,790.68