Finding the Fourth Proportional to 21,032.42, 31,539.39 and 7,875.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,032.42 : 31,539.39 = 7,875.56 : x
2. Step 2: Convert to fraction form
   21,032.42/31,539.39 = 7,875.56/x
3. Step 3: Cross multiply
   21,032.42x = 31,539.39 × 7,875.56
4. Step 4: Simplify right side
   21,032.42x = 248,390,200.61
5. Step 5: Solve for x
   x = 248,390,200.61/21,032.42
6. Step 6: Final answer
   x = 11,809.88