Finding the Fourth Proportional to 78,381, 108,196.78 and 54,521.52

Step by Step Solution

1. Step 1: Write the proportion equation
   78,381 : 108,196.78 = 54,521.52 : x
2. Step 2: Convert to fraction form
   78,381/108,196.78 = 54,521.52/x
3. Step 3: Cross multiply
   78,381x = 108,196.78 × 54,521.52
4. Step 4: Simplify right side
   78,381x = 5,899,052,904.71
5. Step 5: Solve for x
   x = 5,899,052,904.71/78,381
6. Step 6: Final answer
   x = 75,261.26