Finding the Fourth Proportional to 61,143.21, 91,730.79 and 21,170.52

Step by Step Solution

1. Step 1: Write the proportion equation
   61,143.21 : 91,730.79 = 21,170.52 : x
2. Step 2: Convert to fraction form
   61,143.21/91,730.79 = 21,170.52/x
3. Step 3: Cross multiply
   61,143.21x = 91,730.79 × 21,170.52
4. Step 4: Simplify right side
   61,143.21x = 1,941,988,524.31
5. Step 5: Solve for x
   x = 1,941,988,524.31/61,143.21
6. Step 6: Final answer
   x = 31,761.31