Finding the Fourth Proportional to 65,572.48, 90,588.72 and 42,965.20

Step by Step Solution

1. Step 1: Write the proportion equation
   65,572.48 : 90,588.72 = 42,965.20 : x
2. Step 2: Convert to fraction form
   65,572.48/90,588.72 = 42,965.20/x
3. Step 3: Cross multiply
   65,572.48x = 90,588.72 × 42,965.20
4. Step 4: Simplify right side
   65,572.48x = 3,892,162,472.54
5. Step 5: Solve for x
   x = 3,892,162,472.54/65,572.48
6. Step 6: Final answer
   x = 59,356.65