Finding the Fourth Proportional to 70,242.10, 105,363.18 and 28,689.10

Step by Step Solution

1. Step 1: Write the proportion equation
   70,242.10 : 105,363.18 = 28,689.10 : x
2. Step 2: Convert to fraction form
   70,242.10/105,363.18 = 28,689.10/x
3. Step 3: Cross multiply
   70,242.10x = 105,363.18 × 28,689.10
4. Step 4: Simplify right side
   70,242.10x = 3,022,774,807.34
5. Step 5: Solve for x
   x = 3,022,774,807.34/70,242.10
6. Step 6: Final answer
   x = 43,033.66