Finding the Fourth Proportional to 78,578.76, 108,436.98 and 42,767.88

Step by Step Solution

1. Step 1: Write the proportion equation
   78,578.76 : 108,436.98 = 42,767.88 : x
2. Step 2: Convert to fraction form
   78,578.76/108,436.98 = 42,767.88/x
3. Step 3: Cross multiply
   78,578.76x = 108,436.98 × 42,767.88
4. Step 4: Simplify right side
   78,578.76x = 4,637,619,748.20
5. Step 5: Solve for x
   x = 4,637,619,748.20/78,578.76
6. Step 6: Final answer
   x = 59,018.74