Finding the Fourth Proportional to 65,980.64, 98,967.72 and 21,628.28

Step by Step Solution

1. Step 1: Write the proportion equation
   65,980.64 : 98,967.72 = 21,628.28 : x
2. Step 2: Convert to fraction form
   65,980.64/98,967.72 = 21,628.28/x
3. Step 3: Cross multiply
   65,980.64x = 98,967.72 × 21,628.28
4. Step 4: Simplify right side
   65,980.64x = 2,140,501,559.12
5. Step 5: Solve for x
   x = 2,140,501,559.12/65,980.64
6. Step 6: Final answer
   x = 32,441.36