Finding the Fourth Proportional to 12,907.50, 17,810.61 and 7,164.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,907.50 : 17,810.61 = 7,164.87 : x
2. Step 2: Convert to fraction form
   12,907.50/17,810.61 = 7,164.87/x
3. Step 3: Cross multiply
   12,907.50x = 17,810.61 × 7,164.87
4. Step 4: Simplify right side
   12,907.50x = 127,610,705.27
5. Step 5: Solve for x
   x = 127,610,705.27/12,907.50
6. Step 6: Final answer
   x = 9,886.55