Finding the Fourth Proportional to 51,061.50, 70,464.90 and 28,705.50

Step by Step Solution

1. Step 1: Write the proportion equation
   51,061.50 : 70,464.90 = 28,705.50 : x
2. Step 2: Convert to fraction form
   51,061.50/70,464.90 = 28,705.50/x
3. Step 3: Cross multiply
   51,061.50x = 70,464.90 × 28,705.50
4. Step 4: Simplify right side
   51,061.50x = 2,022,730,186.95
5. Step 5: Solve for x
   x = 2,022,730,186.95/51,061.50
6. Step 6: Final answer
   x = 39,613.61