Finding the Fourth Proportional to 21,945.84, 32,918.72 and 7,907.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,945.84 : 32,918.72 = 7,907.72 : x
2. Step 2: Convert to fraction form
   21,945.84/32,918.72 = 7,907.72/x
3. Step 3: Cross multiply
   21,945.84x = 32,918.72 × 7,907.72
4. Step 4: Simplify right side
   21,945.84x = 260,312,020.52
5. Step 5: Solve for x
   x = 260,312,020.52/21,945.84
6. Step 6: Final answer
   x = 11,861.57