Finding the Fourth Proportional to 212,662.44, 318,995.82 and 91,066.56

Step by Step Solution

1. Step 1: Write the proportion equation
   212,662.44 : 318,995.82 = 91,066.56 : x
2. Step 2: Convert to fraction form
   212,662.44/318,995.82 = 91,066.56/x
3. Step 3: Cross multiply
   212,662.44x = 318,995.82 × 91,066.56
4. Step 4: Simplify right side
   212,662.44x = 29,049,851,981.78
5. Step 5: Solve for x
   x = 29,049,851,981.78/212,662.44
6. Step 6: Final answer
   x = 136,600.76