Finding the Fourth Proportional to 21,807.72, 32,701.86 and 7,947

Step by Step Solution

1. Step 1: Write the proportion equation
   21,807.72 : 32,701.86 = 7,947 : x
2. Step 2: Convert to fraction form
   21,807.72/32,701.86 = 7,947/x
3. Step 3: Cross multiply
   21,807.72x = 32,701.86 × 7,947
4. Step 4: Simplify right side
   21,807.72x = 259,881,681.42
5. Step 5: Solve for x
   x = 259,881,681.42/21,807.72
6. Step 6: Final answer
   x = 11,916.96