Finding the Fourth Proportional to 66,111.75, 99,146.58 and 21,728.25

Step by Step Solution

1. Step 1: Write the proportion equation
   66,111.75 : 99,146.58 = 21,728.25 : x
2. Step 2: Convert to fraction form
   66,111.75/99,146.58 = 21,728.25/x
3. Step 3: Cross multiply
   66,111.75x = 99,146.58 × 21,728.25
4. Step 4: Simplify right side
   66,111.75x = 2,154,281,676.89
5. Step 5: Solve for x
   x = 2,154,281,676.89/66,111.75
6. Step 6: Final answer
   x = 32,585.46