Finding the Fourth Proportional to 70,239.72, 105,359.68 and 28,686.72

Step by Step Solution

1. Step 1: Write the proportion equation
   70,239.72 : 105,359.68 = 28,686.72 : x
2. Step 2: Convert to fraction form
   70,239.72/105,359.68 = 28,686.72/x
3. Step 3: Cross multiply
   70,239.72x = 105,359.68 × 28,686.72
4. Step 4: Simplify right side
   70,239.72x = 3,022,423,639.45
5. Step 5: Solve for x
   x = 3,022,423,639.45/70,239.72
6. Step 6: Final answer
   x = 43,030.12