Finding the Fourth Proportional to 51,561.15, 71,153.72 and 28,900.10

Step by Step Solution

1. Step 1: Write the proportion equation
   51,561.15 : 71,153.72 = 28,900.10 : x
2. Step 2: Convert to fraction form
   51,561.15/71,153.72 = 28,900.10/x
3. Step 3: Cross multiply
   51,561.15x = 71,153.72 × 28,900.10
4. Step 4: Simplify right side
   51,561.15x = 2,056,349,623.37
5. Step 5: Solve for x
   x = 2,056,349,623.37/51,561.15
6. Step 6: Final answer
   x = 39,881.76