Finding the Fourth Proportional to 52,188.71, 72,019.77 and 28,315.20

Step by Step Solution

1. Step 1: Write the proportion equation
   52,188.71 : 72,019.77 = 28,315.20 : x
2. Step 2: Convert to fraction form
   52,188.71/72,019.77 = 28,315.20/x
3. Step 3: Cross multiply
   52,188.71x = 72,019.77 × 28,315.20
4. Step 4: Simplify right side
   52,188.71x = 2,039,254,355.40
5. Step 5: Solve for x
   x = 2,039,254,355.40/52,188.71
6. Step 6: Final answer
   x = 39,074.63