Finding the Fourth Proportional to 65,289.52, 90,066.37 and 42,641.78

Step by Step Solution

1. Step 1: Write the proportion equation
   65,289.52 : 90,066.37 = 42,641.78 : x
2. Step 2: Convert to fraction form
   65,289.52/90,066.37 = 42,641.78/x
3. Step 3: Cross multiply
   65,289.52x = 90,066.37 × 42,641.78
4. Step 4: Simplify right side
   65,289.52x = 3,840,590,334.94
5. Step 5: Solve for x
   x = 3,840,590,334.94/65,289.52
6. Step 6: Final answer
   x = 58,823.99