Finding the Fourth Proportional to 21,032.28, 31,529.88 and 7,875.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,032.28 : 31,529.88 = 7,875.42 : x
2. Step 2: Convert to fraction form
   21,032.28/31,529.88 = 7,875.42/x
3. Step 3: Cross multiply
   21,032.28x = 31,529.88 × 7,875.42
4. Step 4: Simplify right side
   21,032.28x = 248,311,047.55
5. Step 5: Solve for x
   x = 248,311,047.55/21,032.28
6. Step 6: Final answer
   x = 11,806.19