Finding the Fourth Proportional to 21,025.62, 31,534.47 and 7,875.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,025.62 : 31,534.47 = 7,875.18 : x
2. Step 2: Convert to fraction form
   21,025.62/31,534.47 = 7,875.18/x
3. Step 3: Cross multiply
   21,025.62x = 31,534.47 × 7,875.18
4. Step 4: Simplify right side
   21,025.62x = 248,339,627.45
5. Step 5: Solve for x
   x = 248,339,627.45/21,025.62
6. Step 6: Final answer
   x = 11,811.29