Finding the Fourth Proportional to 52,811.31, 72,881.30 and 28,939.50

Step by Step Solution

1. Step 1: Write the proportion equation
   52,811.31 : 72,881.30 = 28,939.50 : x
2. Step 2: Convert to fraction form
   52,811.31/72,881.30 = 28,939.50/x
3. Step 3: Cross multiply
   52,811.31x = 72,881.30 × 28,939.50
4. Step 4: Simplify right side
   52,811.31x = 2,109,148,381.35
5. Step 5: Solve for x
   x = 2,109,148,381.35/52,811.31
6. Step 6: Final answer
   x = 39,937.44