Finding the Fourth Proportional to 52,780.24, 72,835.17 and 28,906.40

Step by Step Solution

1. Step 1: Write the proportion equation
   52,780.24 : 72,835.17 = 28,906.40 : x
2. Step 2: Convert to fraction form
   52,780.24/72,835.17 = 28,906.40/x
3. Step 3: Cross multiply
   52,780.24x = 72,835.17 × 28,906.40
4. Step 4: Simplify right side
   52,780.24x = 2,105,402,631.78
5. Step 5: Solve for x
   x = 2,105,402,631.78/52,780.24
6. Step 6: Final answer
   x = 39,889.98