Finding the Fourth Proportional to 52,739.35, 72,780.05 and 28,540.30

Step by Step Solution

1. Step 1: Write the proportion equation
   52,739.35 : 72,780.05 = 28,540.30 : x
2. Step 2: Convert to fraction form
   52,739.35/72,780.05 = 28,540.30/x
3. Step 3: Cross multiply
   52,739.35x = 72,780.05 × 28,540.30
4. Step 4: Simplify right side
   52,739.35x = 2,077,164,461.02
5. Step 5: Solve for x
   x = 2,077,164,461.02/52,739.35
6. Step 6: Final answer
   x = 39,385.48