Finding the Fourth Proportional to 120,410.78, 166,009.32 and 103,595.63

Step by Step Solution

1. Step 1: Write the proportion equation
   120,410.78 : 166,009.32 = 103,595.63 : x
2. Step 2: Convert to fraction form
   120,410.78/166,009.32 = 103,595.63/x
3. Step 3: Cross multiply
   120,410.78x = 166,009.32 × 103,595.63
4. Step 4: Simplify right side
   120,410.78x = 17,197,839,261.23
5. Step 5: Solve for x
   x = 17,197,839,261.23/120,410.78
6. Step 6: Final answer
   x = 142,826.41