Finding the Fourth Proportional to 40,139.35, 55,374.84 and 28,210.48

Step by Step Solution

1. Step 1: Write the proportion equation
   40,139.35 : 55,374.84 = 28,210.48 : x
2. Step 2: Convert to fraction form
   40,139.35/55,374.84 = 28,210.48/x
3. Step 3: Cross multiply
   40,139.35x = 55,374.84 × 28,210.48
4. Step 4: Simplify right side
   40,139.35x = 1,562,150,677.89
5. Step 5: Solve for x
   x = 1,562,150,677.89/40,139.35
6. Step 6: Final answer
   x = 38,918.19