Finding the Fourth Proportional to 12,899.50, 17,801.31 and 7,310.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,899.50 : 17,801.31 = 7,310.50 : x
2. Step 2: Convert to fraction form
   12,899.50/17,801.31 = 7,310.50/x
3. Step 3: Cross multiply
   12,899.50x = 17,801.31 × 7,310.50
4. Step 4: Simplify right side
   12,899.50x = 130,136,476.76
5. Step 5: Solve for x
   x = 130,136,476.76/12,899.50
6. Step 6: Final answer
   x = 10,088.49