Finding the Fourth Proportional to 52,390.94, 72,300.78 and 28,518.91

Step by Step Solution

1. Step 1: Write the proportion equation
   52,390.94 : 72,300.78 = 28,518.91 : x
2. Step 2: Convert to fraction form
   52,390.94/72,300.78 = 28,518.91/x
3. Step 3: Cross multiply
   52,390.94x = 72,300.78 × 28,518.91
4. Step 4: Simplify right side
   52,390.94x = 2,061,939,257.00
5. Step 5: Solve for x
   x = 2,061,939,257.00/52,390.94
6. Step 6: Final answer
   x = 39,356.79