Finding the Fourth Proportional to 128,971.10, 193,128.60 and 123,066.20

Step by Step Solution

1. Step 1: Write the proportion equation
   128,971.10 : 193,128.60 = 123,066.20 : x
2. Step 2: Convert to fraction form
   128,971.10/193,128.60 = 123,066.20/x
3. Step 3: Cross multiply
   128,971.10x = 193,128.60 × 123,066.20
4. Step 4: Simplify right side
   128,971.10x = 23,767,602,913.32
5. Step 5: Solve for x
   x = 23,767,602,913.32/128,971.10
6. Step 6: Final answer
   x = 184,286.27