Finding the Fourth Proportional to 51,139.89, 70,572.83 and 28,479.15

Step by Step Solution

1. Step 1: Write the proportion equation
   51,139.89 : 70,572.83 = 28,479.15 : x
2. Step 2: Convert to fraction form
   51,139.89/70,572.83 = 28,479.15/x
3. Step 3: Cross multiply
   51,139.89x = 70,572.83 × 28,479.15
4. Step 4: Simplify right side
   51,139.89x = 2,009,854,069.10
5. Step 5: Solve for x
   x = 2,009,854,069.10/51,139.89
6. Step 6: Final answer
   x = 39,301.10