Finding the Fourth Proportional to 211,895.28, 318,120.72 and 142,086.96

Step by Step Solution

1. Step 1: Write the proportion equation
   211,895.28 : 318,120.72 = 142,086.96 : x
2. Step 2: Convert to fraction form
   211,895.28/318,120.72 = 142,086.96/x
3. Step 3: Cross multiply
   211,895.28x = 318,120.72 × 142,086.96
4. Step 4: Simplify right side
   211,895.28x = 45,200,806,017.81
5. Step 5: Solve for x
   x = 45,200,806,017.81/211,895.28
6. Step 6: Final answer
   x = 213,316.72