Finding the Fourth Proportional to 65,520.47, 90,430.25 and 42,879.57

Step by Step Solution

1. Step 1: Write the proportion equation
   65,520.47 : 90,430.25 = 42,879.57 : x
2. Step 2: Convert to fraction form
   65,520.47/90,430.25 = 42,879.57/x
3. Step 3: Cross multiply
   65,520.47x = 90,430.25 × 42,879.57
4. Step 4: Simplify right side
   65,520.47x = 3,877,610,020.59
5. Step 5: Solve for x
   x = 3,877,610,020.59/65,520.47
6. Step 6: Final answer
   x = 59,181.66