Finding the Fourth Proportional to 65,025.06, 89,678.40 and 42,355.50

Step by Step Solution

1. Step 1: Write the proportion equation
   65,025.06 : 89,678.40 = 42,355.50 : x
2. Step 2: Convert to fraction form
   65,025.06/89,678.40 = 42,355.50/x
3. Step 3: Cross multiply
   65,025.06x = 89,678.40 × 42,355.50
4. Step 4: Simplify right side
   65,025.06x = 3,798,373,471.20
5. Step 5: Solve for x
   x = 3,798,373,471.20/65,025.06
6. Step 6: Final answer
   x = 58,413.99