Finding the Fourth Proportional to 128,464.10, 192,696.15 and 123,215.30

Step by Step Solution

1. Step 1: Write the proportion equation
   128,464.10 : 192,696.15 = 123,215.30 : x
2. Step 2: Convert to fraction form
   128,464.10/192,696.15 = 123,215.30/x
3. Step 3: Cross multiply
   128,464.10x = 192,696.15 × 123,215.30
4. Step 4: Simplify right side
   128,464.10x = 23,743,113,931.10
5. Step 5: Solve for x
   x = 23,743,113,931.10/128,464.10
6. Step 6: Final answer
   x = 184,822.95