Finding the Fourth Proportional to 78,724.51, 108,639.16 and 42,913.77

Step by Step Solution

1. Step 1: Write the proportion equation
   78,724.51 : 108,639.16 = 42,913.77 : x
2. Step 2: Convert to fraction form
   78,724.51/108,639.16 = 42,913.77/x
3. Step 3: Cross multiply
   78,724.51x = 108,639.16 × 42,913.77
4. Step 4: Simplify right side
   78,724.51x = 4,662,115,410.55
5. Step 5: Solve for x
   x = 4,662,115,410.55/78,724.51
6. Step 6: Final answer
   x = 59,220.64