Finding the Fourth Proportional to 52,810.81, 72,880.61 and 28,939.00

Step by Step Solution

1. Step 1: Write the proportion equation
   52,810.81 : 72,880.61 = 28,939.00 : x
2. Step 2: Convert to fraction form
   52,810.81/72,880.61 = 28,939.00/x
3. Step 3: Cross multiply
   52,810.81x = 72,880.61 × 28,939.00
4. Step 4: Simplify right side
   52,810.81x = 2,109,091,463.69
5. Step 5: Solve for x
   x = 2,109,091,463.69/52,810.81
6. Step 6: Final answer
   x = 39,936.74