Finding the Fourth Proportional to 212,443.05, 318,978.65 and 141,805.78

Step by Step Solution

1. Step 1: Write the proportion equation
   212,443.05 : 318,978.65 = 141,805.78 : x
2. Step 2: Convert to fraction form
   212,443.05/318,978.65 = 141,805.78/x
3. Step 3: Cross multiply
   212,443.05x = 318,978.65 × 141,805.78
4. Step 4: Simplify right side
   212,443.05x = 45,233,016,266.60
5. Step 5: Solve for x
   x = 45,233,016,266.60/212,443.05
6. Step 6: Final answer
   x = 212,918.32