Finding the Fourth Proportional to 12,075.31, 16,663.93 and 7,039.75

Step by Step Solution

1. Step 1: Write the proportion equation
   12,075.31 : 16,663.93 = 7,039.75 : x
2. Step 2: Convert to fraction form
   12,075.31/16,663.93 = 7,039.75/x
3. Step 3: Cross multiply
   12,075.31x = 16,663.93 × 7,039.75
4. Step 4: Simplify right side
   12,075.31x = 117,309,901.22
5. Step 5: Solve for x
   x = 117,309,901.22/12,075.31
6. Step 6: Final answer
   x = 9,714.86