Finding the Fourth Proportional to 52,435.20, 72,360.72 and 28,561.80

Step by Step Solution

1. Step 1: Write the proportion equation
   52,435.20 : 72,360.72 = 28,561.80 : x
2. Step 2: Convert to fraction form
   52,435.20/72,360.72 = 28,561.80/x
3. Step 3: Cross multiply
   52,435.20x = 72,360.72 × 28,561.80
4. Step 4: Simplify right side
   52,435.20x = 2,066,752,412.50
5. Step 5: Solve for x
   x = 2,066,752,412.50/52,435.20
6. Step 6: Final answer
   x = 39,415.36