Finding the Fourth Proportional to 12,899.42, 17,801.40 and 7,235.43

Step by Step Solution

1. Step 1: Write the proportion equation
   12,899.42 : 17,801.40 = 7,235.43 : x
2. Step 2: Convert to fraction form
   12,899.42/17,801.40 = 7,235.43/x
3. Step 3: Cross multiply
   12,899.42x = 17,801.40 × 7,235.43
4. Step 4: Simplify right side
   12,899.42x = 128,800,694.60
5. Step 5: Solve for x
   x = 128,800,694.60/12,899.42
6. Step 6: Final answer
   x = 9,985.00