Finding the Fourth Proportional to 21,280.62, 31,914.18 and 7,238.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,280.62 : 31,914.18 = 7,238.15 : x
2. Step 2: Convert to fraction form
   21,280.62/31,914.18 = 7,238.15/x
3. Step 3: Cross multiply
   21,280.62x = 31,914.18 × 7,238.15
4. Step 4: Simplify right side
   21,280.62x = 230,999,462.40
5. Step 5: Solve for x
   x = 230,999,462.40/21,280.62
6. Step 6: Final answer
   x = 10,854.92