Finding the Fourth Proportional to 21,056.59, 31,568.23 and 7,907.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,056.59 : 31,568.23 = 7,907.50 : x
2. Step 2: Convert to fraction form
   21,056.59/31,568.23 = 7,907.50/x
3. Step 3: Cross multiply
   21,056.59x = 31,568.23 × 7,907.50
4. Step 4: Simplify right side
   21,056.59x = 249,625,778.73
5. Step 5: Solve for x
   x = 249,625,778.73/21,056.59
6. Step 6: Final answer
   x = 11,855.00