Finding the Fourth Proportional to 70,431.79, 105,472.42 and 49,272.78

Step by Step Solution

1. Step 1: Write the proportion equation
   70,431.79 : 105,472.42 = 49,272.78 : x
2. Step 2: Convert to fraction form
   70,431.79/105,472.42 = 49,272.78/x
3. Step 3: Cross multiply
   70,431.79x = 105,472.42 × 49,272.78
4. Step 4: Simplify right side
   70,431.79x = 5,196,919,461.01
5. Step 5: Solve for x
   x = 5,196,919,461.01/70,431.79
6. Step 6: Final answer
   x = 73,786.56