Finding the Fourth Proportional to 193,443.30, 289,934.55 and 81,123.30

Step by Step Solution

1. Step 1: Write the proportion equation
   193,443.30 : 289,934.55 = 81,123.30 : x
2. Step 2: Convert to fraction form
   193,443.30/289,934.55 = 81,123.30/x
3. Step 3: Cross multiply
   193,443.30x = 289,934.55 × 81,123.30
4. Step 4: Simplify right side
   193,443.30x = 23,520,447,480.02
5. Step 5: Solve for x
   x = 23,520,447,480.02/193,443.30
6. Step 6: Final answer
   x = 121,588.33