Finding the Fourth Proportional to 61,128.02, 91,661.78 and 21,679.22

Step by Step Solution

1. Step 1: Write the proportion equation
   61,128.02 : 91,661.78 = 21,679.22 : x
2. Step 2: Convert to fraction form
   61,128.02/91,661.78 = 21,679.22/x
3. Step 3: Cross multiply
   61,128.02x = 91,661.78 × 21,679.22
4. Step 4: Simplify right side
   61,128.02x = 1,987,155,894.21
5. Step 5: Solve for x
   x = 1,987,155,894.21/61,128.02
6. Step 6: Final answer
   x = 32,508.10