Finding the Fourth Proportional to 76,578.33, 114,852.34 and 72,780.79

Step by Step Solution

1. Step 1: Write the proportion equation
   76,578.33 : 114,852.34 = 72,780.79 : x
2. Step 2: Convert to fraction form
   76,578.33/114,852.34 = 72,780.79/x
3. Step 3: Cross multiply
   76,578.33x = 114,852.34 × 72,780.79
4. Step 4: Simplify right side
   76,578.33x = 8,359,044,038.55
5. Step 5: Solve for x
   x = 8,359,044,038.55/76,578.33
6. Step 6: Final answer
   x = 109,156.79