Finding the Fourth Proportional to 103,216.94, 154,606.69 and 77,978.96

Step by Step Solution

1. Step 1: Write the proportion equation
   103,216.94 : 154,606.69 = 77,978.96 : x
2. Step 2: Convert to fraction form
   103,216.94/154,606.69 = 77,978.96/x
3. Step 3: Cross multiply
   103,216.94x = 154,606.69 × 77,978.96
4. Step 4: Simplify right side
   103,216.94x = 12,056,067,732.31
5. Step 5: Solve for x
   x = 12,056,067,732.31/103,216.94
6. Step 6: Final answer
   x = 116,803.19