Finding the Fourth Proportional to 78,628.26, 108,503.72 and 42,818.18

Step by Step Solution

1. Step 1: Write the proportion equation
   78,628.26 : 108,503.72 = 42,818.18 : x
2. Step 2: Convert to fraction form
   78,628.26/108,503.72 = 42,818.18/x
3. Step 3: Cross multiply
   78,628.26x = 108,503.72 × 42,818.18
4. Step 4: Simplify right side
   78,628.26x = 4,645,931,813.63
5. Step 5: Solve for x
   x = 4,645,931,813.63/78,628.26
6. Step 6: Final answer
   x = 59,087.30