Finding the Fourth Proportional to 15,867.98, 21,902.64 and 9,158.00

Step by Step Solution

1. Step 1: Write the proportion equation
   15,867.98 : 21,902.64 = 9,158.00 : x
2. Step 2: Convert to fraction form
   15,867.98/21,902.64 = 9,158.00/x
3. Step 3: Cross multiply
   15,867.98x = 21,902.64 × 9,158.00
4. Step 4: Simplify right side
   15,867.98x = 200,584,267.61
5. Step 5: Solve for x
   x = 200,584,267.61/15,867.98
6. Step 6: Final answer
   x = 12,640.82