Finding the Fourth Proportional to 123,534.78, 170,496.29 and 78,216.98

Step by Step Solution

1. Step 1: Write the proportion equation
   123,534.78 : 170,496.29 = 78,216.98 : x
2. Step 2: Convert to fraction form
   123,534.78/170,496.29 = 78,216.98/x
3. Step 3: Cross multiply
   123,534.78x = 170,496.29 × 78,216.98
4. Step 4: Simplify right side
   123,534.78x = 13,335,704,513.92
5. Step 5: Solve for x
   x = 13,335,704,513.92/123,534.78
6. Step 6: Final answer
   x = 107,951.01