Finding the Fourth Proportional to 78,750.76, 108,648.90 and 54,868.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,750.76 : 108,648.90 = 54,868.72 : x
2. Step 2: Convert to fraction form
   78,750.76/108,648.90 = 54,868.72/x
3. Step 3: Cross multiply
   78,750.76x = 108,648.90 × 54,868.72
4. Step 4: Simplify right side
   78,750.76x = 5,961,426,072.41
5. Step 5: Solve for x
   x = 5,961,426,072.41/78,750.76
6. Step 6: Final answer
   x = 75,699.92