Finding the Fourth Proportional to 123,171.60, 184,830.30 and 81,173.10

Step by Step Solution

1. Step 1: Write the proportion equation
   123,171.60 : 184,830.30 = 81,173.10 : x
2. Step 2: Convert to fraction form
   123,171.60/184,830.30 = 81,173.10/x
3. Step 3: Cross multiply
   123,171.60x = 184,830.30 × 81,173.10
4. Step 4: Simplify right side
   123,171.60x = 15,003,248,424.93
5. Step 5: Solve for x
   x = 15,003,248,424.93/123,171.60
6. Step 6: Final answer
   x = 121,807.69