Finding the Fourth Proportional to 61,057.92, 91,597.28 and 21,066.06

Step by Step Solution

1. Step 1: Write the proportion equation
   61,057.92 : 91,597.28 = 21,066.06 : x
2. Step 2: Convert to fraction form
   61,057.92/91,597.28 = 21,066.06/x
3. Step 3: Cross multiply
   61,057.92x = 91,597.28 × 21,066.06
4. Step 4: Simplify right side
   61,057.92x = 1,929,593,796.32
5. Step 5: Solve for x
   x = 1,929,593,796.32/61,057.92
6. Step 6: Final answer
   x = 31,602.68