Finding the Fourth Proportional to 65,086.47, 89,792.83 and 42,417.21

Step by Step Solution

1. Step 1: Write the proportion equation
   65,086.47 : 89,792.83 = 42,417.21 : x
2. Step 2: Convert to fraction form
   65,086.47/89,792.83 = 42,417.21/x
3. Step 3: Cross multiply
   65,086.47x = 89,792.83 × 42,417.21
4. Step 4: Simplify right side
   65,086.47x = 3,808,761,326.60
5. Step 5: Solve for x
   x = 3,808,761,326.60/65,086.47
6. Step 6: Final answer
   x = 58,518.48