Finding the Fourth Proportional to 65,513.12, 90,407.61 and 37,218.81

Step by Step Solution

1. Step 1: Write the proportion equation
   65,513.12 : 90,407.61 = 37,218.81 : x
2. Step 2: Convert to fraction form
   65,513.12/90,407.61 = 37,218.81/x
3. Step 3: Cross multiply
   65,513.12x = 90,407.61 × 37,218.81
4. Step 4: Simplify right side
   65,513.12x = 3,364,863,659.14
5. Step 5: Solve for x
   x = 3,364,863,659.14/65,513.12
6. Step 6: Final answer
   x = 51,361.68