Finding the Fourth Proportional to 10,557.72, 15,852.57 and 8,384.07

Step by Step Solution

1. Step 1: Write the proportion equation
   10,557.72 : 15,852.57 = 8,384.07 : x
2. Step 2: Convert to fraction form
   10,557.72/15,852.57 = 8,384.07/x
3. Step 3: Cross multiply
   10,557.72x = 15,852.57 × 8,384.07
4. Step 4: Simplify right side
   10,557.72x = 132,909,056.56
5. Step 5: Solve for x
   x = 132,909,056.56/10,557.72
6. Step 6: Final answer
   x = 12,588.80