Finding the Fourth Proportional to 65,349.05, 90,167.94 and 42,721.20

Step by Step Solution

1. Step 1: Write the proportion equation
   65,349.05 : 90,167.94 = 42,721.20 : x
2. Step 2: Convert to fraction form
   65,349.05/90,167.94 = 42,721.20/x
3. Step 3: Cross multiply
   65,349.05x = 90,167.94 × 42,721.20
4. Step 4: Simplify right side
   65,349.05x = 3,852,082,598.33
5. Step 5: Solve for x
   x = 3,852,082,598.33/65,349.05
6. Step 6: Final answer
   x = 58,946.27